Despite being relatively young to the game, I have encountered no little cases of people just refusing to do even that.

Like, when tanking, I could mark myself during say, a boss like Storge which could be tricky to figure out if going in blind, yet people would still refuse to follow or listen to advice.

Now, as for your friend, yelling at someone for failing is bad sure, but doing what he does is plain unsocial/toxic behavior. What Kikitia above says could also be labeled as antisocial/egotistical behavior. In the sense that even in a simple dungeon, if the tank presses random buttons, AND the healer is a cure I troll, AND the dps are doing their rotations wrong, the run WILL fail. If it does not fail, it simply means some people have to work twice as hard and potentially get their fun soured to make up for the rest. That to me, does not sound very right...