Naturally. I do understand accidental pulls and mistakes. This only goes for the player that is directly attempting to tank by pulling beyond my level of comfort, which isn't that bad, as I generally pull large groups. However, I have a good understanding of my own ability to tank, as well as if I am doing other things IRL like watching stocks and updating my numbers there, which will take precedence over a random group on a game, especially a jerk that assumes that I have nothing better to do but push for the fastest possible time to complete a random dungeon or raid.
Essentially, if they become a problem specifically for me by pulling for me repeatedly, I'll simply let them do it and tunnel on being DPS, which is much simpler to do, but still get my satchel at the end because they were impatient.
However, if someone else in the group begins to complain, especially my healer. I whisper them to let him run off on his own and die so we can kick the DPS that is too impatient to care about how others are feeling about the pacing of the dungeon. My healer's opinion on pacing is the most important opinion compared to the DPS as they are the least commodity in group finder options and I don't feel like waiting in queues (actually, I rarely even consider a DPS's opinion, as they are so easy to replace that they don't even really matter).