How do you guys deal with this

His mom calling me a dumb bitch , says I’m using my boyfriend for a place to stay.. when he begged me to move in and I help him with everything so how would that be using? We were cool at one point but me & his kids mother got into it ( it’s dropped now ) , and I guess she called her crying ( btw the bm is very bitter and a lier ) so yeah how would you guys feel? She comes over every Sunday his mom.. I feel like she disrespected me