1. Religion, we all know it's a crock, but it seems unPC to state it is.
2. Politics, the only thing dumber to discuss than Religion.
3. Culture, because we all know most culture is just religion and or politics in a pretty wrapper.
4. People insisting that a person is a 'troll' all because they refuse to swim with the current.
5. People stating they are not smart enough/good enough to know something or be capable of something, being told they are stupid/useless and then getting pissed off because you back up their lousy opinion of themselves. Step one, you are not incapable of a great many things, so stop saying you aren't. For instance telling me 'oh I don't know/understand [insert common basic computer knowledge here]'. really gauls me something fierce actually. Bad enough I hate dummies, but I hate dummies confident they are dummies. Almost glad my loaner computer appears to have died of old age, now I can't suffer through my friend who was borrowing it respond to ever lack of comprehension with "I only learn by doing" every siiiiingle time I tried to explain anything no matter how rudimentary. I mean what do you do eh, tell them to start learning by doing a lot more a lot faster so that they finally have a friggin clue.
6. People that consider this a long post. Get a fucking life.