GAME05, I've had similar experiences with certain co-workers, so a bit of advice: - Control what you can control. Cliche' but true. People can be jerks. Prepare yourself in dealing with him. Get things in writing (email). - My guess is that your boss (and others) knows the guy is a jerk and uses a grain of salt with what he hears from that person. - Don't reciprocate. You don't have to be best buds, but be a good co-worker no matter what. Its a losing battle to reciprocate because you justify his actions. - Remember that if that person isn't in a position of high esteem to you (like a significant other, parent, sibling, close friend, mentor) why would their opinion of you mean a hill of beans? Be more interested in the people that really matter. edit - spelling, clarification