How should I go about a racist mother?

I am so much in love with a white man and I am black. My family is completely accepting. His mother doesn't condone our relationship. I know I should support him. But forgive me for saying, meeting a racist woman wasn't part of my plan. I never wanted to be put in a position that someone judges me before they get to know me. How would meeting here sway her judgment to begin with. I can deal with strangers. What I cannot deal with is feeling belittled by the mother of the man I love.