Mom against my relationship with a guy because of his parents

I am already 22 years old, I work, live with my mother, sister and brothers. I met a young man, and we have been together for 7 months. At first everything was fine, my mother was glad that I found myself a good young man and even sometimes fantasized about how she would babysit our future children, her grandchildren.

But after the last of our quarrels with him, the mothers on both sides got into the argument. Omitting the details and details, I will only say that they strongly quarreled among themselves, each proving their rightness, and now my mother is categorically against our relationship with this guy, and this despite the fact that she did not change her opinion at all. "He's good, but his family is bad, so I want you to give it up" - these are her words. But we love each other and plan to come together, live together a little, and then get married.

But I do not want to constantly fight with my mother because of this. And she takes all my arguments with hostility. Like, I'm stupid, I'm going to suffer and suffer with his family, although we are not going to live with them. I just can not tell her that I have my own head on my shoulders, and that I am not seventeen years old, and that if I make a mistake, I will also clear up myself. Mom's advice I listen to, I do not want to offend her, but I want to decide for myself, and I want to arrange my future myself, without anyone's interference, even my mother. Life is mine. In general, now I do not know how, after all that has happened, to establish relations with my mother, how to reconcile our mothers and live peacefully with a young man. I ask you all for your advice. Thank you.