Future mother-in-law says she won't attend my bridal shower if it's "too black." Why should I tolerate her?

My maid of honor sent out the bridal shower invitations last week. FMIL called FH and told him point blank that she will not attend the shower if it is "too black" and that my family has already made sure the wedding will be "too black" by serving food that she and her family can't eat (FH and I will have southern/soul food at the reception-we both love it!) and she hates that we will have "black music) at the reception (FH and I are playing our fave music, old school (clean) rap and rnb) and "way too many black traditions at the wedding" (FH and I are jumping the broom and there will be kente cloth at the reception) She says this is not how she thought her son's wedding would be, that she raised him better than that and she and her family will be uncomfortable at a shower that is "too black". FMIL says she wants a "normal bridal shower". This pissed me off. This woman is racist and I don't care if she is FH's mom. As of right now, I told FH the shower invite is retracted and that I don't want racism spoiling my shower. FH is telling her today that her attitude is not welcome and that if she doesn't learn to be more accepting, she will not be welcome at any future events. Am I not right to put my foot down? By the way, FH is white and I am black.