It has been said that Wagner would wear white gloves to conduct music written by Jewish composers, then remove them after the performance, throwing them on the stage to have them swept up later.
FWIW, it is a fact that Wagner insisted that the premier of “Parsifal” (to be performed at Bayreuth in 1882) be conducted by Hermann Levi (the son of a rabbi).
Not denying that he was a pitiful excuse for a human being, but he did recognize - and acknowledge - talent.