You're right, belonging to a country that's committing genocide shouldn't stop you having fun.
As a Frenchman, I'm proud to know that we organized concerts and plays in Paris in the 40s to entertain the poor Nazi soldiers who had seen so many horrors.
The man is homophobic, but that's not the point.
The point is that jokes about him simulating a fellatio are also based on homophobic prejudice, like "look, the man knows how to suck a dick. He's so gay, lol".