"Why do you "guys" seem to think that folk music isn't of other cultures from all around the entire world, and is only of the USA/England?"

I don't think that, and I listen to and enjoy loads of different traditional musics from many nations and cultures.

But unfortunately - and I think in many ways this is a huge own goal - we don't have precise terminologies in British and American folk musics in the same way other cultures do. We just have the catch-all 'folk'. We don't have, for example, bhangra or bal folk. We don't even have many words for specific sub-forms, the way other countries have ghazal or calypso or klezmer or zouk or Mariachi or rebetika.

If I want to refer to any of those aforementioned folkloric forms I will do so using those terms.

And by the same token I use the standard accepted term that the vast majority of people seem to use when referring to traditional English, Irish, Scottish, Welsh, North American and Canadian music. Which is currently, for better or worse, the word "folk".