That is very true. Everyone can be an asshole. In my personal experience, which doesn't really hold up as true evidence but whatever, the percentage of asshole players is highest for tanks, then f
DPS and then Healers. I used to tank in other MMOs, and some in this game actually, and I rarely found an asshole healer. As a Healer I find far more asshole tanks than DPS and as a tank I really only find asshole DPS. This may be partially how I play though. If a tank is pulling too fast and I can't keep up or they don't wait for me to get mana back I will speak up politely. This can sometimes get a very negative reaponse. I also speak up when I'm a tank and the DPS are running ahead and/or pulling. This again can get a very negative response. People just don't like being asked to do things really.