What do I do if my boyfriends mom doesn't like me?

I'm not a social media whore, but I still use Instagram and Facebook. My boyfriend's mom has posted a pictures of him with every girl he has EVER dated (only 2 girls less than a month) and EVERY girl he has gone to a dance with (3 different girls) i have been dating him for 6 months. I have yet to be tagged in anything by her. I just want her acceptance. I'm half Mexican half Filipino and played lacrosse all my life and did cross country for a few years. My boyfriend's family is very white and VERY into running. Even girl he has dated or gone to a dance with was white and in track and cross country. We go o the same college and both still live at home. So I'm at his house fairly often. Every time I go she always says rude comments. His mom tells him she doesn't like me because I'm too polite. He's a mommas boy so I feel like I NEED her approval. What do I do???