It’s not a matter of whether or not it’s objectionable. The time to argue that point was before the game.
If it wasn’t objectionable then the matter should have been a non issue. I do see this as a control issue.
Look, I don’t approve of a lot of things kids do today. That doesn’t mean that it’s open season when they do something that wasn’t on the script.
Some teacher was worried someone was going to think they approved of this, and they melted down over it. Too bad they didn’t notice the people in the stands thought it was a hoot.