He doesn't refer to Jews as Plague carriers. He refers to liberals as plague carriers. He actually praises and shares his respect for Orthodox Jews and conservative Jews.
The plague-carriers, so to speak, are the secularized, liberal, middlebrow Jews whose vulgarity sets the tone for American politics, public discourse, and popular culture.
I don't know why this statement is racist. Replace Jews with blacks. Would you call that an anti-black statement? No.