So you believe that the people who don't like what Chappelle has become in the last few years understand what jokes are, but don't think that Chappelle is joking?

I think that speaks much more to how you define a joke. From what you said, it seems to me that you believe that a joke is completely devoid of meaning and context; that the selection of material and the way it's told has no bearing on the beliefs of the person telling it. I think you'll find that most people don't share this definition.

Jokes, like every other form of communication, are a type of rhetoric. You can tell a lot about a person from the things they find funny. Dave, for instance, seems to find the idea that Trans people are crazy or lying about being trans to be hilarious (judging from his last couple of specials). Most of the people here don't share that belief.