Having grown up in Germany i was surprised how many people in the US would strike up a conversation randomly in the street with me - I thought it’s a normal thing and never really experienced it in Germany - there I would always be suspicious that people try to scam me or get money or something.
I do agree with GP that in Latin America it’s super common and normal to chat with everyone.
But there are many levels to this - it’s for example less common in Nordic countries at least in my experience but you can speak to people in every place on earth, it’s something universal.
we push away chatty strangers in the United States
Where? I've lived on the coasts, I live in the Midwest, that has not been my experience aside from anti-social persons.Seattle is the worst. They call it the "seattle freeze." The San Francisco Bay Area became almost as bad in covid.
The south is still friendly. Austin is incredibly friendly with strangers. Miami has strong stranger vibe. NYC is still alive, too.
If nothing else, the nerves and flashbulb memories overwrite old nerves and flashbulb memories.
On the guy side, they usually seem too preoccupied to talk, or are moving with friends/family where interjecting as a stranger would be weird (because you either need to address the group or else you seem like you're attempting to break them off into a conversation away from that group). Though I'll give that the "too preoccupied" is sometimes merely an affect hiding, "This loser has nothing to offer me."