It's a team game whether you like it or not. If you want to relax play with npcs or a likeminded premade.

I personally have met a "you pull you tank" tank before when I was leveling a dps. Healer was onboard but me pulling caused the tank to ragequit along with the other dps that was with him (in tam tara NORMAL, i.e. a dungeon that doesn't matter). Don't grief people by not doing the role you signed up for.

People these days have too fragile of an ego. If you have an issue you could ask them, otherwise if they say no to your request you can put up with it or leave. I'm just being blunt here.