First of all, let’s try to avoid American-bashing, and stay respectful to everyone.
I’ll start: for me it’s the tipping culture. Especially nowadays, with the recent post on !mildlyinfuriating@lemmy.world with the 40% tip, it just seems so weird to me to have to pay extra just so that menu prices can stay low.
18-21 is very common here in the South. I haven’t heard of younger personally. But I’m not rural. Know of some towns very religious and inbred, I’m sure it’s happening there.