i think its more a 2 way street,
What ive seen happen is someone ask for help, like a strategy and the tank says "Get lost scrub" and leaves the group. Its most likely the reason why most first timers dont ask what to do in higher dungeon/primal fights. Most pricks just think they should already know the strategy and stuff to do.

Then if the team gets wiped, by an honest mistake, you will have pricks who just up and leave on first wipe. This is essentially annoying during HM primal fights as you can not replenish your members