system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is it rude to wear hats in buildings?

I never understood why or how this is rude.
gpt
It's merely a social condition. We've been taught to do that simply because our parents told us to, and their parents told them to, and so on. No one can really say when or why it became that way. Social conditions never have any practical reason for existing. If you think wearing a hat indoors is ok, then by all means, invite your friends over for an indoor hat party.