IM TIRED OF MY GIRLFRIEND COMPLAINING ABOUT HER MOM!?

My girlfriends mother is really overprotective, overbearing, and psycho so she always has something negative to say about me and my girlfriends relationship for no reason and im really tired of hearing my girlfriend complain because it makes me angry and also I always say something negative about her mom when she does it so should I tell my girlfriend to not talk to me about her mom's negative comments anymore?