Taking things entirely out of context means that blanket conclusions are likely to be off the mark, eh?
I would be inclined to agree with Mister Bridge about the right of an artist or folksinger to wear anything he chooses, and print on it any essage he likes.
As to what that might do to the effect created by his act...I'm inclined to think it is self-defeating. Bad taste, at best, and offputting. But no worse than name-calling.