This is something global, every place has some kind of racism. The country were I did found myself at ease from the few I have lived on was South Korea. And I think it was because I tried to learn the language. Even in Germany I felt ok, most of the race issues I had there were from immigrants, mostly from Turkey, Syria, and Ukraine. Never had an issue with Germans, and I traveled most of the country.
The think that sets Bjorn away from the rest is that he lived there, he knows the culture, and he works in a trade that is highly regarded by the elite in Japan. He trained in one of the most recognized bonsai nurseries there. I don't see him having issues. His kid is still small, so he will get to go to school and hopefully be ok because he is going to grow along side Japanese kids. The big problem comes with older kids (like Army brats...) that move into the country because they had to, most of them have no intentions in learning Japanese or even learning some of the culture... those are the ones that will face consequences.
This is the latest video from Eisei-en, the statement he makes from where the video starts don't only apply to bonsai, but universally. When you go to a foreign country, you are just a guest, until you become a citizen of that country.