I don't know how you feel but this one drives me crazy: People who think they are better than others. To me, it just shows how little you like yourself -- if you get off on making someone feel bad about themselves.

So today, I watched someone talk down to someone else. Is this ever necessary? You never know what someone else is going through or where they have been until you've talked to them. I say we get to know everyone at work, even everyone in the building you work in.  You can learn something from everyone.  And who knows, they'll probably surprise you.  If you feel like someone doesn't appreciate you, just know the problem is  them and not you.