BF’s racist mom said this in front of me

I was at my boyfriend of 3 year’s house today and he was trying on some clothes for his mom. His family is Indian, and it is well known (to me, BF, friends, my family etc.) that she is not a fan of me. She has even cried to other Indian friend’s moms before about me. I am very respectful and have never broken any of their rules, I do not curse, I am not obnoxious, I have shown interest in their culture, I am in college and get good grades, and I am very nice to his family as well as very loving and accepting of their son. We make each other very happy. As he was trying on clothes for a wedding they will be attending as a family, she told him he looked very handsome in an outfit and continued to say that, then eventually said in a pleased tone “and there will be (Indian) girls for you to meet there too”. Right in front of me. I could have reached out and touched her, she knew I heard. Boyfriend dodged comment but looked at her weirdly, and apologized later. He also later asked her not to say that but she didn’t care. This is not a surprising comment to hear from her. She is honestly the worst most of the time- won’t let him see me, talks badly of me, pressures him to end things and date an Indian girl (I am white). Has completely killed my confidence, and I can’t ever help but compare myself to Indian girls now and I feel like not enough. What would you have said? (I said nothing but I don’t doubt I’ll hear that again) We are adults and act like it and we know we are getting married in a few years, and she knows we are serious. Should I let her walk all over me? Or should I remind her I exist and he isn’t interested? What would you say next time?