This. Generally, I run as a DPS and end up running into tanks or healers that are immensely critical without even suggesting how to improve. They pull even when their team is falling behind and repeat difficult pulls that are too taxing on the party even after causing wipes. Then, if you accidentally do pull aggro in these instances and immediately switch targets or drop to auto attack, you still get to keep the mob til you or it dies. As a DPS, there is almost nothing you can do to discourage rude tanks or healers. I find most prima donna players are attracted to these classes, rather than to NIN or DRG.
