You're right that it's not OP's job to fix broken people.
If the broken person wishes to change, he can. He can ask for help. I hope this wasn't a cry for help because it got lost.
However, signalling that his behavior is not OK is important for everyone else at the table. Maybe there is some naive young guy sitting there who didn't think the jerk's comment was okay, but without seeing any kind of sanction he may start thinking "oh, that's how I'm supposed to talk to be respected." Make sure that he doesn't end up thinking that. It's also important for the person who was insulted, of course.
If the broken person wishes to change, he can. He can ask for help. I hope this wasn't a cry for help because it got lost.
However, signalling that his behavior is not OK is important for everyone else at the table. Maybe there is some naive young guy sitting there who didn't think the jerk's comment was okay, but without seeing any kind of sanction he may start thinking "oh, that's how I'm supposed to talk to be respected." Make sure that he doesn't end up thinking that. It's also important for the person who was insulted, of course.