That's the biggest problem, when doing events no one says anything or they say something smart like "Just keep mobs off of us" or "keep HP up". You did the right thing, people think because they won't see you again they can act however they want. We did a run and the tank was new it was the level 32 dungeon.

There's always one person who tanks to take the role of leader and say what to do, so I let him do it. Then when he got mad at the tank for not knowing what to do on some things I explained it to him

"He's new, he told you he was new you can either yell at him call him names and we can loose or you can act like the leader you want to be and instruct him and get us a win."

Guess some people forget, not everyone is a 1.0 player or spends 5 a.m. - 3 a.m playing all day.