It's breaking the laws of the country who are indirectly created by the "public," it has nothing to do with mob mentality. We are a nation of laws. In fact, republics are a safeguard against mob mentality which can happen in direct democracy.

Until being offensive is illegal, it should hold no bearing in a just trial. Fortunately, we have the first amendment, which makes being an obnoxious asshole in and of itself perfectly legal.