I went to a middle school that had a lot of Jewish kids and I had one teacher who was Jewish and treated the non-Jewish kids like crap. If she thought your question was "stupid", she would sarcastically berate you in front of the whole class as if you were an adult instead of a 10 year-old. However, the Jewish kids routinely got away with skipping homework assignments with no penalty. It was unbelievable.
Several years after I had this horrible teacher, my little brother had her too and he said she was still the exact same way. Finally she retired, there was much rejoicing from the poor abused gentile kids. Looking back on it, she really should have been reprimanded or fired - no one could get away with that stuff today.
BTW, all my best friends at this school were Jewish, so my experience with this one psychotic teacher didn't turn me into an anti-semite or anything.