Setting aside jokes, I've listened to many different types of rap, but I don't like rap that's intellectual. I prefer the mainstream songs about drugs and partying (e.g. Rick Ross and Lil' Wayne) to the songs that try to start a dialogue about social issues (e.g. Common).
I'm open to hearing about intellectual issues when I read articles or listen to talk radio, but I really don't like music that tries to make a point because I associate music with entertainment. Interesting how the medium can affect the message on a person to person basis.