I hate it when:
People throw out weird insults for no reason.
When people resort to petty insults for flaming. I mean really, if you're gonna go all the way, you can do better than "stupid Miss Fortune didn't come mid."
People who act like spoiled brats. I had a nasus the other game who forgot ignite, so the moment i died once, even though I'd gotten a kill before that, he did this: sigh. quinn, switch with me._ That's right. He forgot something, and expected me to follow his whims so that he could do better. I'd normally be more willing to comply, but he'd called mid in champ select. This, of course, leads me to my next one:
People who try to justify their behavior. After that Nasus didn't get his way, he began accusing me of not being a team player. Listen, buddy. If you slip up, the least you can do is not get mad when I don't want to give up the position that I know how to play quinn in (top, by the way. I figure I may as well fuel the fires of hatred), and you can just try to do well or at least farm under tower.