I don't believe Republicans are prejuduced towards black people, but there are those that do.?

I actually asked a black person that believed that Republicans were prejudice towards blacks and asked him: What if you're not racist towards black people but have a problem with gay marriage? In some people's view Republicans don't like either gays or blacks and Democrats like gays both guys and blacks? If you like black people a lot but have a problem with gay marriage, which party do you vote for Republicans or Democrats? A black person told me that you don't vote at all. What do you think?