Its rooted in culture and how people are socialized to relate to public spaces and the people around them. Here’s Lee Kuan Yew talking about the same problem he faced in Singapore at first: https://medium.com/@barronqasem/the-moral-behind-lee-kuan-ye... (“The difficult part was getting the people to change their habits so that they behaved more like first world citizens, not like third world citizens spitting and littering all over the place.”).

I only really have experience with Americans and Bangladeshis, but in my experience Americans are Nazis about littering and recycling. I was talking with a law school professor once after class and dropped a diet coke bottle into the trash in front of her. Without missing a beat she reached into the trash bin to take it out and threw it into the recycling bin.