first
"Japan is known to be a racist nation. They don't take kindly to non-Japanese moving there.
It does need to change.".............
They have been a melting pot for longer then the good ole US of A, and if anyone bothers to learn a bit of their language and culture they are far more excepting then most Americans or even Europeans.
Second
"The portrayal of other minorities in the classroom, was both tasteless and offensive."
.......................................................
IF you know anything about their culture you see that they are making fun of themselves just as much! the whole point is to push the boundaries of everything, maybe not the best thing for everybody, but there are plenty of us that are not a bunch of bleeding heart Neanderthals that can and do get the joke. so if you don't understand instead of attacking just walk away or you end up being exactly what you "clam" to hate.
It does need to change.