I've noticed a few posters on serverfault that take potshots (ad hominem, or insinuations of stupidity) at people. This would seem to be in violation of:

Always be polite and have fun It’s fine to disagree and express concern, but please be civil. There’s a real human being on the other end of that network connection, however misguided they may appear to be. We’re here to learn from our peers, not yell at each other.

However they seem to get away with it. Is it because they have high rep, or because they hang out with mods in the chat rooms?