How to deal with a difficult father in-law?

I've been with my fiance for six years now, and things are good between him and I. But I dont get along with my future father in-law. We used to get along back during the first year we started dating, but then afterwards his true colors came out. He hated my race( I'm half black, half white. and his family is mostly hispanics.) Used to tell me that he wanted grandchildren with blonde hair blue eyes not part black. I did everything to make him happy, cleaned the house, wash dishes, did his laurndry, picked up the trash in his room. etc.. but still he thought I wasnt "Worthy" or being with his son. He used to do things that would keep my fiance and I from spending time togther, like taking him out places and leaving me at home when I would try to go, he would tell my fiance "You dont want to bring a ham sandwhich to a banquet." And he always put me down about everything! and he would tell him things about me that wasnt true to get him to dislike me. It really sucked!! So just over a year ago I decided I was going to stick up for myself, and now I only clean up after my fiance and myself, and not his father. So I continue to get called "lazy". I been trying to avoid him so he doesnt have a reason to be mean to me. (And by the way we been living with him this whole time.) Now I do tell my fiance about what his dad treats me like, and he sometimes tries to stick up for me, but the for the most part, he tells me "There's nothing I can do, that's just how my dad is." I get along real well with his mom but I cant stand his dad.