I find it disgusting that people from America and Europe only use toilet paper to clean themselves after using the bathroom instead of water.
Why is it disgusting that they only use toilet paper?
You can catch diseases and all kind of stuff and it's just not hygienic
Not being fond of poor hygiene makes sense but what you're being disgusted by is a cultural difference. Not every culture uses bidets and trying to force that onto them isn't right. I'm sure there's something you do in your culture that they probably don't agree with and you wouldn't like it if they talked about it.
Well I've never seen anyone from your country wash up
Then how would you know if they're not doing so properly? Instead of making assumptions it's probably okay to believe that most cultures can clean themselves properly. It's one of society's basic teachings in all cultures.