Challenge the person for making bigoted comments and using derogatory language, and ask them to discuss their views on equality and diversity.
RD sez "I support these people. They are as homophobic as I am! Homophobia is 'a good cause'." But RD, since you apparently support racism -- at least, you have steadfastly refused to say anything against it, how can you support a group of black ministers? Isn't that hypocritical?