What's the deal with dps pulling packs and not paying attention to the tank in low keys?

I was doing some 11s on a tank alt on Sunday and basically every group I had was completely oblivious to what I was doing. Most of the time it's fine. Finish a pack jump to the next pack. I had a couple of true wtf moments though. Do dps realize how fucking annoying it is when they fuck up pulls? Sometimes I wanna pull bigger, but forcing me to play catch up on aggro makes it so I don't. Sometimes they fuck up the positioning of the mobs. Sometimes I'm waiting for the healer with 0% mana to drink. Sometimes im wating 3 seconds for a pat that we need for % to be safe to pull and you shouldnt just run ahead and try to solo the next pack. And to the DK who I asked nicely at the beginning of the dungeon to let me pull, but continued to pull the rest of the dungeon to spite me; genuinely, fuck you.

Edit: to be clear, as much as it's easier for me to find a group than them, I'm not going to brick some guys key and leave because someone in the group sucks or is an asshole. I'm not into that God complex tank bullshit. I have to confess that 80% of the way through the dungeon I did tell the DK I'd let him die if he continues, and almost did after he pulled while the healer literally had 0% manna. It was after the 3rd boss of temple so little time would be lost, but the healer sprung up to save him and I just don't have the conscience to fuck up someone's key without feeling guilty, especially since it was the healers key.