I have left a job because of a coworker like this, and ended up at one with a manager like this. Left that and found another job with a coworker like this. The

I have left a job because of a coworker like this, and ended up at one with a manager like this. Left that and found another job with a coworker like this. The point is people like this are pervasive, want to win at any cost and have no sense of fairness. The thing that keeps them in their place is power, if possible. Confidence matters a lot too. Don’t seek validation from him, just don’t care about his opinion of you, and make sure he knows it. Don’t be rude, or give him any leverage, just look at him like he is your friends obnoxious kid.