Tank mentality of any tank worthy of the title: Im the leader. I know what I'm doing, I know what everyone else needs to do, so that in the [Often occuring] case that they dont, I can tell them. I want to get through this dungeon as quickly as possible without being overly reckless.

Problem?
-Ok, he could be new. Kindly explain what needs to be done so it dosnt happen again.
-Alright, This guy isn't too bright, Lets try this again. Use small words.
-K, getting frustrated here. Either this guy's tree dosnt go all the way to the top branch, or Hes just blatantly causing trouble. Either way, something needs to change here. Warn him once more, be blunt.
-Ragequit, possibly telling him what you really think of him.
-Give your FC a brief summary of recent events, hear their stories, remember your not the only one this happens to, take a short break involving either hot chocolate or kool-aid, depending on the weather, because your classy like that, and reque.