I know how emotionally destructive that can be, I've been throught it with my family, again and again. Tbh I don't have any good advise, because I couldn't manage to let it not upset me.
Since I've changed my lifestyle their respect has increased and they let me be. All I can say is believe in your own journey, your own strenght, perspective and knowledge of what is right for you and your body. Believe in yourself and goodluck💛