That has been my (limited) experience as well. For me as an extremely introverted European, visiting US was quite a culture shock.
All the American people I’ve met have been very kind, easy to approach and hold a conversation with, and ready to help out a stranger in need. Honestly the last part was what stick out with me the most. Here in my country, I have no doubt that if I collapsed on the street, there would be 10 people stepping over my body before someone decided to check if I needed help.