I've loved BM since Meatballs, but I thought this was an interesting point, "lost in the funny retellings is the melancholy reality of an older, divorced dad partying with 20-somethings." It made me wonder how I'd view my own father if he was doing things like this on a regular basis. Probably not too favorably.
Maybe let your father live his own life as he wants it and don't judge him?
(Ironically, that's a common advice people give to parents regarding their kids).
Besides do you know what's REAL melancholy for an "older, divorced dad"?
NOT partying at all, and not having people to love/care for them. Second worse, would be only having boring older people conversations and pass-times. If they can be that relevant that even 20th year olds are OK to hang around with them, more power to them.
What would be indeed be lame would be to TRY/WANT to party with younger people, and them rejecting you. Or partying with younger people but not being able to connect with another person out of "party" scenarios. Which I'd guess is not the case here.
That sort of reinforces his point. His dad, or most people's dad, would likely be that lame person trying to party with younger people, but failing because they aren't famous.
But Bill Murray is an entertainer by trade. His employer is a studio, but he performs for an audience. So he isn't really partying with them in any normal sense, he is dropping in on his clients in their environment and just being cool. This guy is just extremely cool, that's what makes it different, a level of cool only a handful of people can occupy at any point in history.