You have to remain calm in this situations unfortunately. I do feel the CM shouldn't have done that even though I can sympathize with his frustration.

Chances are this CM got fired.
Being a CM is tough sometimes. Especially when guest ignore things that are done for their own safety or they come up and yell at you because of Brazilian tourists or because things cost so much. You have to smile and take it but that's the way it is with most jobs.
COP is tough because people decide to ignore the remain seating rule and the ride restarts. I've been on it when two guests decided to leave and the ride restarts. I think that it shouldn't do this since it is punishing the ones who love the ride and are regarding the rules. Maybe there is some way to reset it and allow CM's to escort guests off.
I've also seen guest attempt to do this in the HM during the stretching room and it cut the show short.