I have the privilege of one of my good friends being a healer, so if she sees a DPS trying that with me in content I don't want to pull wall to wall (for me, rare, but sometimes on DRK I'll just run out of cooldowns and decide to start DPS on a group before pulling more for MP/cd countdown, but even on DRK this is rare for me) we will rescue him into us and warn him not to do it again. If he does it again, I let him hold aggro and healer doesn't heal him. It's rare that I don't pull entire dungeons, so if I do there's usually a reason for it. Particular mob does extra damage, waiting on a key cooldown/resource, whatever it may be. If I am not with my partner in crime, I will politely ask them to let me pace the pulls, I may not trust the healer or something, and then I match their respect. I had a Reaper yelling at me in smileton because I couldn't keep up with him, which was a damn meme because he'd start running before pulls ere dead, use sprint, and dash forward all in one go to the next group. I was with my healer partner for this one, so when he did the same thing to aggro the boss, I just took my tank stance off, let him eat the tankbuster and die, then replaced my tank stance. It's one thing to pretend this game is a race (Like I see people in this thread doing) it's another thing to play in a way that requires other players to go beyond their levels of comfort. Just show them the respect they showed you.
An eye for an eye only blinds those that would blind you.