*1323 - what gets you really upset?

Many things, but a big one is a sweeping generalization.  People say stereotypes exist for a reason but that doesn't give you the right to assert your assumptions.  Even the well-intentioned sometimes rile me up: an earnest attempt to prove your acceptance of homosexuality to me, for instance, by bragging about your token "gay friend" only goes to annoy me because a friend is a friend is a friend so keep your friend's sexuality and your embarrassing shallow-mindedness to yourself.  It's not that I actively reject knowing about your friends' sexuality; the point is that you don't need to wave a label over their heads when it's irrelevant to the situation.