Boyfriends mom

So my boyfriend was drunk one night and we were talking about random stuff and all of a sudden he says “so I’m gonna tell you something now because if I don’t I’ll never say it. But don’t get mad.” So I responded saying alright go ahead. He begins to tell me that his mother doesn’t like me for the most outrageous reason. He told me she didn’t like me because in her words I said “colored people”. But my boyfriend knows I never like talking about race I don’t even like watching racial movies. So why the hell would I talk to his mother OF ALL PEOPLE about a subject I dislike. Not to mention I’m mixed with black and white. Majority of my family is black. I have never in my life used the term “colored” because I know the history of the term. I know it was (and still is) a form of degradation. And she told him I was talking about my sisters boyfriend but he is Hispanic so MA’AM what are you going on about?! Also she’s very strict and won’t let him be a grown ass man calling him at 3 am wondering where he is, what he’s doing, when he’s coming back home. He’s 26. Pays his bills. If you know he’s at my house why the hell are you blowing up his phone? She won’t even let him stay the night. I just don’t understand why someone would use a subject so sensitive to get in between my relationship. I’m not dating his mom I’m dating him.