Took the words right out of my mouth…err…keyboard. I’d like to tweak this a bit though…how about people who are convinced that they are right (as in, they quite honestly BELIEVE in their rightness), will not entertain the possibility that you have a point, and will hold a decades long grudge, all the while expecting you to apologize for every little breach in protocol.
Another one of mine is people who are in some sort of competition that you never knew about. As in, you spent 5 minutes talking to her, but only 3 to me. You spoke to her about XYZ, but not to me. You held her baby at the party, but not mine. Makes me want to tear my hair out, all the while wondering what happened to this person in their childhood to make them so incredibly insecure.