My tolerance goes out the window when:
- Someone is being rude to the other players
- The tank thinks he is superman and repeatedly faceplants even when people say they can't keep up with the pulls.
- Tanks who pull massive mobs with two party members that have crap AoEs.
- Healers who think it's their job to stand there and look pretty while alt+tabbed on reddit.
- DPS who think they can tank.
- DRK who think they are DPS.
- Healers who don't heal or who spam their highest heal constantly.
- Anyone who's rude in chat/obnoxious when there's a wipe without damn good reason.
- Players who go balls to the walls expecting everyone to know their playstyle and who get irritated when they get called on it or the party can't keep up.
- People who troll dungeons. Hate that crap.