I agree. That joke wasn't the worst I've ever heard or seen, but it falls into a generally nasty category of sexist jokes where the point is that women have some sort of moral duty to put on fat where men like to see it and avoid it where men don't like to see it, any woman who fails to distribute her fat in this unnatural fashion deserves to be humiliated, and any woman who doesn't think this is funny has no sense of humor. Yukk! And that last step is waaaay out of line!