Because anti-racism only exists to fight racists; it only has meaning oppositionally. If there were no racists, there would be no anti-racists. And the racists say: Jews are not white. The Nazis said it all the time – the project of the Jews, as far as they were concerned, was to undermine the Aryan white races. And the exclusion of Jews from the category of whiteness is still key to present-day white supremacists.
