Oddly enough, I was almost kicked recently for that very reason.
I was doing SM on my healer Monk, and this tank keeps dying and getting pissd off and starts talking shit saying shitty healer and whatnot. He then says in chat "this guy is just trolling now, kick him". I finally speak up and tell him to stop standing in fire and he wont die. He then starts to rage and try and make me feel stupid by sayjmg tnere js no fire, then a dps speaks up and tells him there is fire, and I informed hi, that he should either turm up his graphics or get a pc that can handle SM. We thrn booted him and continued on with the Warlocks blueberry tanking with no problems,.