I also really haven't seen this happen, and I played bard, dragoon, and scholar before moving on to warrior in 3.3. I saw people being idiots to others in groups earlier on in the game, but I feel a lot of the more immature people left and went back to WoW or whatever. At this point so many people know the dungeons so well that even if a tank messes up it's usually not a huge deal, even with a wipe. Usually if someone starts with that kind of thing the other 2 in the party shut him up.
