How to Deal With a Toxic Coworker (The Petty and the Practical)

Every office has one. The coworker who does not do anything obviously wrong, but somehow every meeting with them ends with you staring at a wall wondering if you are the problem.

You are not the problem. You are just working with a toxic coworker. It happens. It happens a lot. And there is a whole spectrum of things you can do about it, from the professional and boring to the private and satisfying.

This is a guide to both. First the signs, so you know what you are actually dealing with. Then the practical strategies that will not blow up your career. Then, at the end, the petty-but-legal fun and the anonymous letter option, because sometimes you just need to get it out of your body and into an envelope.

Signs of a toxic coworker

A toxic coworker is not just someone you do not like. It is not someone who eats fish in the microwave. It is not someone who talks loudly on calls. Those people are annoying. Toxic is a different tier.

You are dealing with a toxic coworker when you notice a repeating pattern, not a bad day. Look for these:

• →They take credit for your work. In meetings, in emails, in offhand comments to the boss. Always cheerful. Always a "we" that used to be a "you."
• →They exclude you from information you need to do your job. Suddenly you are the last to know about the deadline, the change, the new hire.
• →They gossip about everyone, and are extremely charming to your face. You will hear a version of yourself from a third party that you do not recognize.
• →They move goalposts. What was fine on Monday is a problem on Wednesday, and they act like it was always a problem.
• →They weaponize niceness. Sugar-coated jabs. Compliments that end with "for someone at your level."
• →They make you feel small in ways that are impossible to describe to someone who was not in the room.
• →You leave every interaction with them slightly more tired than you started.
• →You start rehearsing conversations in your head before you have them.

That last one is the tell. If you are prepping for a two-minute chat like it is a deposition, you are not being sensitive. You are being trained.

Why toxic coworkers are so hard to explain

The reason it is so hard to describe a toxic coworker to your partner, your friends, or HR is that no single moment sounds bad on its own. It is the pattern. It is the drip.

You cannot walk into HR and say "she said good morning weird." You cannot say "he asked me for a status update but the way he asked me was a whole thing." That is not a case. That is a diary entry.

This is why documentation matters, and why you need practical strategies before you need catharsis. You have to protect yourself in the boring, official ways first, so that when you decide to also be petty in your personal life, nobody can weaponize your feelings back against you.

Practical strategy 1: Document everything

Start a running log. Not on your work laptop. On your personal phone or a personal notes app.

For every incident, write down:

• →Date and time.
• →Who was there.
• →What was said, as close to verbatim as you can get.
• →What happened right after.
• →How it affected the work.

Do not editorialize in the log. Do not write "she was being toxic again." Write what happened. If you ever end up in an HR conversation, a lawyer conversation, or a "he said, she said" review, this log becomes the difference between a vibe and a case.

Bonus move: when they say something suspect in person, follow up with a "just to confirm what we discussed" email. That email is now dated, timestamped, and on record. This is one of the oldest tricks in office survival, and it works because it looks like professionalism.

Practical strategy 2: Set boundaries that survive contact

Boundaries with a toxic coworker cannot be feelings. They have to be systems.

• →Move as much communication to writing as possible. "Great, can you send that in Slack so I have it?" is a full sentence.
• →Stop being available at all hours. If you never answer after 6pm, they cannot make it a habit.
• →Say no with a period, not with a paragraph. Explanations are a doorway.
• →Stop giving them access to your feelings. They collect these and use them later.
• →Do not vent to other coworkers about them. It will get back. It always gets back.

The goal is to make yourself the most boring possible target. Toxic coworkers thrive on reaction. Remove the reaction and they eventually move on to someone easier.

Practical strategy 3: HR, and how to use it correctly

HR is not your friend. HR is not your enemy. HR is a department that protects the company. Once you understand that, HR becomes a much more useful tool.

When you go to HR, frame the issue in the terms they care about:

• →Impact on the work. "This is affecting delivery on X project."
• →Risk to the company. Missed deadlines, lost information, team turnover.
• →A pattern, not a moment. Bring your log.
• →A specific ask. "I would like a facilitated conversation" or "I would like this reassigned."

Do not walk in emotional. Do not walk in asking them to be punished. Walk in with a case and a request. HR is much more likely to act when you make it easy for them to act.

Practical strategy 4: Know when to leave

Sometimes the toxic coworker is protected. Sometimes they are the boss. Sometimes they are the boss's best work friend. Sometimes the culture is the coworker, just at scale.

If you have documented, set boundaries, escalated, and the situation is still eating your evenings, your Sundays, and your health, the correct move is to plan your exit. Not to quit today. To plan.

Update the resume. Start the conversations. Take the calls. Do it quietly and professionally. Your energy is a finite resource, and no job is worth a stress rash.

The petty-but-legal fun section

Okay. You have documented. You have set boundaries. You have talked to HR. You are behaving like a professional adult in the workplace.

Now, in your personal life, off the clock, on your own devices, on your own paper: you are allowed to have a little fun. Petty, as a treat.

Legal, harmless, off-the-record things you can enjoy:

• →Keep a private "greatest hits" doc of their most unhinged quotes. For your own morale only.
• →Write the email you will never send. Read it back a week later. Delete it. Feel five percent lighter.
• →Match their calendar energy. If they book meetings at 8:59pm on a Friday, you can respond at 8:59am on a Monday.
• →Become extremely, aggressively cheerful in every interaction. Nothing rattles them like being met with sunshine.
• →Stop laughing at their jokes. Stop doing the courtesy nod. Their power runs on your reaction.
• →Master the phrase "I will follow up in writing." Say it often. Say it warmly.

None of these will change them. That is fine. They are for you.

The anonymous letter option (as cathartic release)

Here is where a lot of workplace advice stops. Take notes, set boundaries, talk to HR, maybe leave. All correct. All incomplete.

The missing piece is release. You are carrying around a full paragraph of things you will never say to their face because saying them to their face would be a career move you do not want to make. That paragraph does not just evaporate. It sits in your chest.

An anonymous, mailed letter is a way to move that paragraph out of your body and into an envelope. Not sent to their work address. Not sent to be seen by colleagues. Just written, printed, and mailed as a private moment for you, and, quietly, for them.

Why paper, and not a burner email:

• →A letter is not searchable. A letter is not forwardable. A letter cannot be pasted into a group chat with a laughing emoji.
• →A letter forces a private, offline read. That is a rare experience in 2025.
• →A letter is calm. A rage email looks like a rage email. A letter written, edited, and mailed looks like a decision.
• →A letter is closure for the writer, not just the reader.

A well-written anonymous letter is not "you are a monster." It is not a threat. It is not a list of accusations. It is one clean paragraph that names what happened, why it was wrong, and what it cost you. It is the version of the conversation you never got to have. It is for your record, mailed to their address, and then let go.

The line, for real

This is a novelty catharsis brand, not a harassment tool. Every physical mail order is reviewed by a human before it prints. We reject anything that involves threats, sexual content, doxxing, blackmail, targeting minors, or trying to scare someone at work in a way that crosses into harassment.

What is on the table: a sharp, adult, non-threatening letter that says the thing you needed to say. What is not on the table: anything you would be embarrassed to explain to a jury.

Petty is a genre. Harassment is a category. Do not confuse the two.

Keep reading

• →The Resignation Letter for a Toxic Workplace - /blog/resignation-letter-toxic-workplace
• →How to Send an Anonymous Letter (Legally) - /blog/how-to-send-an-anonymous-letter