Maybe instead, he should have stood up in front of the class and said, "There ain't enough soldiers in the whole f'ing army to force us to let n*ggers into this school!" (ala
Strom Thurmond).
Also protected speech. Also memorable. Also an unpopular expression.
Also totally inappropriate in a classroom.
I think flag-burning is protected speech. I don't want to see a constitutional amendment banning it. I also think it is vulgar speech, expressing a deeply hateful sentiment. To trivialize it by making it a classroom stunt destroys the power of the statement in its appropraite context.