What I got out of the Dave Chappelle scene was basically the professor seeing a comedian who whole routine was making fun of the audience. When the professor changed he went back and roasted him back as revenge. The comedian was not prepared and lost it.
How does any of this relate to any controversy of "don't censor our jokes"? Maybe the heckling aspect but that is not what people are worried about when it comes to censoring humor. Of course Bob also recently shown he does not understand zombie shows as entertainment so maybe Bob just doesn't understand any media.