As someone that mains PLD, this kind of attitude is really disappointing to me when I see it. I take pride in my ability as a tank. When I dodge an AoE, I make sure to step back in front of the mob. I silence/stun whatever AoE's I can. Hell, if I see a melee dps get slammed I'll Cover them. Generally, I just try to do everything in my power to make things easier for the party, because of this exact sentiment:
Seriously, queueing for a dungeon should be fun. It shouldn't be a completely miserable experience. It should be four people working together toward the common goal of clearing the instance, not three people having to deal with one complete asshole that just wants fast queue times and can't be bothered to learn to play.