Japan has some of the most horrific pollution disasters of the 20th century and had tremendously polluted water. The clean Japan thing is only true because Japan got very serious about safety after companies were ignoring issues and polluting water.

https://en.wikipedia.org/wiki/Four_Big_Pollution_Diseases_of...

And I don't even get the clean bathrooms connection. Sounds like a random TikTok meme with zero relevance. Half the bathrooms don't even have soap.