The haircuts

Irony poisoning

Pretty much everything.

I think a lot of the therapy speak we use in casual conversation is going to be embarrassing in hindsight. A lot of it is already verifiably inaccurate, but even the stuff based on real psychology can potentially be disproven as understanding and research methods improve. And people will quietly cringe remembering how they used junk science to justify being a dick in 2024.

Yes

...Everything.

Any sort of jokes about hoarding toilet paper or anything else ridiculous during the pandemic. I've always thought they were already cringe to begin with, but I assume that if society doesn't completely collapse before the 2030s that people will hopefully look back and call those cringe.

The American mass murders around the world.