Yes, I have seen that before and you are asking two separate questions. IT WAS THE FAULT OF THE GUESTS that the ride was stopped. What are they just stupid, self centered idiots? They were not following instructions. As for his anger. I don't think it was anger as much as it was frustration. Besides there were two.. one Spanish speaking and one English speaking. They had every right to raise their voices to try and get the mules to do what they were supposed to do to prevent an injury, if possible. No one was listening apparently.
It wasn't happening in the theater we were watching anyway... it was probably in one or more of the others, but, the message would have been broadcast to all theaters. In my mind it was totally justified that the CM sounded stern. It was for the safety of the entitled jerks (just not sure why anyone should care if they get injured), but I would guess it would mean a lot of paperwork for somebody plus the clean up.
You might be able to tell that I have ZERO tolerance for self-involved, brain dead individuals, willing to disrupt everyone else's enjoyment because they didn't want to stay where they were.