>This was theoretically a professional partner event. You wouldn't get a comedian on stage cracking racist jokes at those, so why should sexist jokes be acceptable?*
The question is why wouldn't it be? Racist and reverse racist jokes, jokes playing with national stereotypes in general, are the stock and trade of comedians. Same for jokes about women, marriage, mother's in law, etc.
It's fucking joke. It's not supposed to be the comedian's party line.