Not everyone that needs help are nice people.
This.
Was in a dungeon with a whm that only used cure II and was running out of mana a lot in the middle of fights. A dps said "Hey whm, do you mind if I give you a few tips that'll help you out in the log run from running oom? " the whm replied. "You can but I won't listen" .___.

Bad.

Rude players with elitist attitudes are the worst of them all.
I feel rude bads are way worse, at least with an elitist you can finish the dungeon, can't do that with a horribad that refuses to take advice.