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.
Not as much as in some other places in the world, but it is not at all rare.
On the bus/train, even when it breaks down and we have to wait nearly an hour for it to start moving again, I've seen carriages full of people not speaking a word to each other (except people now think it's ok to speak on their phones, to my great annoyance).
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.If nothing else, the nerves and flashbulb memories overwrite old nerves and flashbulb memories.
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.
I've experienced a lot of cultures, countries, and environments. The United States is KNOWN for being a friendly country of people who will talk to you and smile at you for "no reason" other than because Americans are friendly.
Go to many countries in Europe or even Russia, you'll experience the exact oppositive. If you smile at people or talk to a stranger, you will essentially be treated as if something is wrong with you.
Everyone knows this is true about the US. Your comment is clearly trying to portray the United States in a negative light with something that is entirely not true.
And then there's my experience: someone who has lived in the US for over 30+ years.
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."