Professionalism needs to be brought back to the workplace.
We are at a point where the loud and obnoxious dictate policy because they run to the front and speak for everyone. The behaviour he displayed wouldn't be accepted in the office, it should not be acceptable in a school where the children are more vulnerable.
You have kids learning a different pace and kids struggling to come out of their shell. What that dikkhead did was tell them that the classroom is a stage. It should be a safe space for them and now we have reached irony.