There's a big inconsistency where for some reason women's breasts are seen as a sexual body part that must be covered (despite their actual purpose having nothing to do inherently with sex), but men's chests can be exposed without issue. It's also difficult on the internet where people across the world are communicating to ascribe one set of expectations for everyone. There are cultures where breasts are completely desexualized or where nudity is normalized as just a part of human existence, and there are cultures where the entire body, or much of it, is considered private and covered.