Mayor Mamdani has gone out of his way to avoid being provoked into Jew-hatred, despite the best efforts of New York’s Zionists to do exactly that.
Netanyahu, on the other hand, has done enormous physical, reputational, and spiritual damage to the Jewish people.
He is certainly no friend of the Jews—indeed, he seems to be a friend to no one but himself (and even that is debatable, given how often he behaves like a self-hating Jew).