That's quite alright, you can refuse to perform your role or "teach me a lesson" and I will promptly leave the duty so as to avoid friction. I do not bother speaking in game usually, because nearly everything someone says can be misinterpreted as hostile. People get mad whenever someone only types "aoe plz" or "its ok to pull more " no matter how nice you word it.

You may get another person that enables the present behavior, but I wash my hands of the inevitable argument that will occur when a single-pull tank causes an issue in a current levelling dungeon or 90 dungeon and the resulting fallout. That won't be my problem, and my conscience remains clean on that.