Did he call it "Jew York"? That is the nickname you hear from people like him down here, in Pittsburgh, and in South Jersey. They are under the delusion that the whole city is Jewish except for Harlem and the South Bronx, where the blacks live, Chinatown, and parts of Brooklyn, where the Italians and Irish live, and even most of the suburbs beyond obvious exceptions like Newark. Trying to explain the reality of the situation to the simpleminded is difficult.
Once you reach a level above 20% Jewish, the perception from outside is that you're at 90%. It happened with my suburban town.