"Sir, I disagree with your notion that the American flag in an American school is 'incendiary'. As such, I am now going to go back to class. If you wish to stop me, you may call the police and have me arrested or you can hold me in your office, in either case I will sue your ass and this school district for every penny I can get for depriving me of my education. Your choice."
I had the exact same thought.
It’s a good thing that I wasn’t one of those kids. In my youth, I would have told the school administrators to kiss my ass, and gone back to class with my US flag shirt on.
If they wanted to use force to eject me from the school, there would have been news cameras and lawsuits.
Yeah, I really was like that.