A kid's parents can be instructed to not attend public school in Ogaki, by a school principal, in front of a room full of witnesses, not one willing to contradict him, on the basis of his race.
I have very little desire to litigate American attitudes on race. As a positive statement: there is no city in the United States where a public school principal can literally say "I do not allow $GROUP in my school." at a PTA meeting and expect to be employed 48 hours later.
Having lived in Japan myself I can attest to similar incidents. Another point to make is that some people mistake Japanese politeness to mean they are also being "nice" or favourable; Japanese people on the whole are invariably polite, even when they are being rude or exclusionary.
And one last point to make is that in Japan racism has a somewhat fluid hierarchy; certain races are viewed more favourably than others (occasionally markedly so), the amount of racism is also affected by the social status of the foreigner.
The rationale was "His presence would be disruptive to the educational environment." (That's a very generous translation of「皆に迷惑かけるだろ。」) Forgive me if I have to be oblique about the rest of the story, but it does not include "When apprised that this happened, people in a position of authority immediately said 'That is outrageous! Enroll the kid!'" A school which would take him was eventually located.)
I have very little desire to litigate American attitudes on race. As a positive statement: there is no city in the United States where a public school principal can literally say "I do not allow $GROUP in my school." at a PTA meeting and expect to be employed 48 hours later.