Marxists did not destroy the meaning of “racist”. If you visit sites like wsws.org, you’ll find that Marxists don’t like identitarianism. The people who changed the meaning were neoliberals like Derrick Bell and Kimberle Crenshaw who never showed any interest in Marxism. Identitarianism is the antithesis of Marxism, which seeks to unite the workers of the world, not divide them by race and gender.