Dumb little shits in WoW. So many of them.
Griefing in general.
In my opinion, camping (well, not corpse camping or spawn camping obviously) is a legit tactic but not when the camper himself is being an uptight little **** about it.
Also, arrogance. Massive arrogance.
I occasionally bother dealing with arrogant players, but 99% of the time I just ignore or block them.
I usually don't (and prefer not to) twink my characters when I start them, so I was a little annoyed at having to put up with this heavily-twinked Orc Warrior who had a predilection for following me, constantly challenging me to a duel and spamming /chicken. So I got sick of it. I, being a Mage three levels lower than him and of average gear, finally accepted his duel request and inevitably lost. Despite my superior tactics (he literally just ran at me and relied mostly on auto attack), I lost due to his relatively massive health, having only brought him down to around 50%. He then had the nerve to /yawn at me in a mocking fashion, despite my legitimate disadvantage. If only I could make his monitor explode in his face, the little shit. People like that shouldn't be allowed near computers.
... I just really hate online arrogance in general, tbh. Massive pet peeve of mine. I play games to unwind, not suffer the incessant begging of idiots who apparently see fit to abuse their keyboards and use that to bother the few remaining mild-mannered players left.
Also, if anyone has the nerve to have a go at me in the manner of "LOLOLO YOU PLAY WOW YOU HAVE NO LIFE" and/or "OLOLOL HE YAWNED AT YOU OH NOES LOL", feel free to drown in a river mmkay?