Of course, the above paragraph is probably offensive to Americans. Most humour's offensive to someone. But it's not always clear to whom it's offensive. So men will talk to them. There's a certain undeniable logic in the first answer.
All humour has a target, and most is going to offend someone.
When a black performer uses it to satirise racist attitudes, it can be a scream. The Jewish guys made Jewish jokes, the black guy made black jokes, the intellectual guy made intellectual jokes, the oke from the South made jokes about okes from the South. And they joked about each other - often in broad stereotypes. Which, out of context, are all probably offensive. Maybe we all need to chill on the outrage, just a tad.