IMHO - Everyone in the session should take responsibility for the session. More than once I have heard that one person on a training course will get on a soap box and ruin the meeting for the other delegates. Sometimes the trainer cannot get the "wild hair" to behave and no one else will stand up and say "This is not your show!"

Same thing when I was in university. If a classmate was mucking up a lecture that I was paying good money for, I had no problem telling them to pack it in or leave and stop wasting everyone's time.

More than a few times I had to ask a noisy group of "non-participants" at a session during the Rochester Sweeps to keep it down, so I could hear the performers. I mentioned that it was a planned session and invited them to perfomr. Unfortunately, drink and pure self-centeredness over-ruled me. Still I stayed and kept picking away at them.

People (especially the young arrogant ones) need to be told when they are doing something wrong. In the long run, you will be doing them a favour. Better they don't ruin a future break into fame by creating a past of infamy among the real folk.