Shirley Feeney had Boo-Boo Kitty, and I couldn’t buy the idea that a grown-up would have that awful thing.
Cliff Huxtable had pajamas very similar to those that my mother had bought for me, but he was a grown man and pajamas were for kids.
Actually, it might be more interesting to think of stuff that we totally didn’t have the perspective to see as incongruous at all, but I for one can’t think of anything right now.
I was always kinda disturbed by the holodeck in STNG. It’s the 23rd century, they’re flying around the galaxy in a starship, and the height of adult entertainment is LARPing?
At the time, the holodeck seemed cool to me in principle, but I’d feel pissed off that they always used it for something lame and ordinary like being a western or playing cards or I can’t think of what else now. Like the writers wanted to have an ordinary sitcom instead.
I don’t know about the rest of the male characters choices, but Leonard on TBBT and his superhero underwear is not just childish, it’s kinda creepy. If everyone else has them - and Sheldon seems likely - that’s creepy too.
Many of the male clothing choices on TBBT seem childish. In the early seasons I would have sworn that Howard’s outfits were adult Garanimals, and wondered if that was the only way he was able to dress himself.
There was an episode where Sheldon pointed out her hypocrisy in making fun of the guys for their “stupid and childish” collectibles when she herself collects Care Bears, Beanie Babies, My Little Ponies, and Hello Kitty.