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It is normal social behavior to at least acknowledge other people
Completely depends on culture. Even in the US, I like working in the northeast because people ignore each other and it’s fantastic. In the south it actually impedes my work because it seems like everyone wants to have meaningless conversations all the time.
This is true. Denser populations tend to be more antisocial. Europe and much of the US northeast is crowded, most of the US south is not. It’s also why a lot of people from small-town US think most “city folk” are rude, and that includes many Europeans. It’s really just culture.