Am I wrong for feeling like this?

So my Fiance & I been together since H.S. In the beginning it was rough with his family. We’re an interracial couple. His mom is Mexican & I am black. She had a rocky relationship with him before I got in the picture but when I came in suddenly everything was my fault. She blamed me for him being distant. Its a long story. Anyways I’m one year older than him. We wanted to get married when I was 18 & he was 17 but in my state you need a legal guardian if you’re not 18. Ik we could’ve waited but it was our choice. Anyways he asks her for help & she goes off on him saying “No blah blah blah I dont want N**** grandchildren”. Honestly I felt super hurt. When I was around his family everyone was nice & I’m a quiet person so I’ve been shy so its not like she actually knows me. Its like she’s blaming me for her own bad relationship with her son & some how my race came up. I guess it was said out of anger but me personally if I have a problem with someone, the last thing on my mind is their race. Also when I do have a problem with someone its for a reason. I was hated for no absolute reason.

Since then I rarely speak to her. I still went out with them on family events but I stopped buying her Christmas & birthday gifts. I still do get his siblings stuff. Right now we recently started communicating more because I’m pregnant. She texts me that she’s excited for her first grandchild but what she says still haunts me. She doesn’t know that I know what she said.

I don’t really want my kids around someone if they get mad call them N****. Idk if I’m wrong to feel that way. Should I have gotten over it already?