You’re right. A lot of folks in flyover land mistake New York rude for a Jewish thing. Probably because, unlike most New Yorkers, Jews actually make it outside of the confines of New York City, and are the only New Yorkers a lot of people have ever met.
I read once that a lot of the stereotypically "Jewish" characteristics (as defined by many Americans) are really just Eastern European characteristics picked up by Jews in Eastern Europe (which is probably where most American Orthodox Jews' ancestors came from). A tourist who had recently visited Eastern Europe commented "the people seem so Jewish!"
Okay . . . not it's probably my turn to get called an anti-Semite by someone. Why can't I simply be "anti-Eastern European?"