I think it's not that one instance of calling it fun, but how much it has seemed to come up over the years.

There are also a few moments where Adam sort of hesitates when saying pizza, as if there's a self correction.

Immediately after saying pizza, Jennifer Aniston messed up and said "part" instead of "heart" and corrected herself, as if nervous or excited.

Absolutely, I think there's a lot to question but pizza parties that are actually about PIZZA can be fun, but I also wouldn't believe I'd ever hyper focus on just "pizza parties".

Also it took Jennifer Aniston like 30 years to visually age by 10 and it only really seemed to start post 2016, like a few other people who didn't age.