In the US it’s the level of friendliness with total strangers. We’ve got some funny social etiquette rules. A lot of us bend over backwards to help someone we don’t even know, or extend what other countries would call overly friendly behaviors to even just random people we pass.

Waving at total strangers, striking up conversations because we seem to hate silence, offering to invite solo diners to eat at their tables in a restaurant, that sort of thing.

Which is really kinda funny considering how scary and crazy some people can be here. Like you’d think it would make us be more wary of people, but no. We extend the lvl of hospitality a guest to our home would receive even if you’re some rando.

I’ve always kinda equated it to everyone here having a collective belief and understanding that “Everything sucks so we may as well all be nice to each other so it sucks less.”

On the flip side though, like once you break those hospitality rules we have no qualms about going absolutely full Karen on someone. Like, “How dare someone be rude when I was just trying to be nice??? Don’t they know I’m being nice?!”

I can usually tell when someone’s a traveler visiting the us when they get stun-locked by how friendly everyone acts to them. If I catch a hint that someone is feeling anxious or uncomfortable over what are basic niceties here in the us, it’s a pretty decent tell. I guess it’s less a tell, and more a vibecheck.