This is somewhat overstated. Tourists are fine. There's a push for lots of english signage to make it easier for them to movie around, but they are expected to behave correctly, and not be like youtube man running with dick out in haunted suicide forest.
If someone expects to be a permanent resident, they're expected to be Japanese. Period. No exceptions. And being Japanese means fitting in with other Japanese. Fluent in language, and in customs, change name, maybe dye hair, ect, ect. Even if you are a multimilliondollar sports star with big black dick, if you want permanent residency, no exception. Big black dick is called Sakuragi now. Mexican dude now named Sado Yasutora.>>103024899
Chinese tourists are infamous around the world. Koreans are big in smuggling, the way the Mafia used to. Koreans have rep of being very angry, but I suppose the really angry ones would not be in Japan in the first place.