I think tolerating anti-Semitic harassment is in nearly every case wrong, even if the harassee deserves SOME harassment.
I WHOLE HEARTEDLY WOULD AGREE THAT IT’S
WRONG
IN EVERY CASE.
And, probably in by far the MOST cases should have some intervention against it.
I wonder what would have happened if the Headmaster had merely come alongside the Jewish fellow and taught him some better retorts or some such.