You just know that the same type of people who are virulent anti-semites, if they were jewish, would represent the absolute worst caricature of their own loathing-- they would be the Ur-Jewish Supremacist.
I've tried this, he's a motte-and-bailey guy bc antisemitism is too 'played out' i.e. lacks novelty and lumps you in with the wrong sort. None of which has any bearing on the truth and suspicions of monomania are only confirmed when the suspects protest that they're not wrong.