As a German, who has grown up in a university city, to then attend most of highschool in the deepest woods, I can tell you that jew was a frequent insult among, what they would like you to call, the conservative youth. And these were all intelligent people. German school system sorts by intelligence in 3 degrees. These where what you would call the smart kids.
Lets not even get started on the fact that guys can’t have long hair without being gay, or girls short hair. Dyed hair etc, as well as everyone who is not a conservative clearly being something to shake your head at.
You greatly underestimate the influence stereotypes hold by the parents have on their kids.
Also, Japanese getting A+ is because they do, infact, study like it’s their job. Studying for school is taken pretty seriously in Japan.