Is it ever ok to be called weak?

He is going through something at home with his mom. He will call me and complain about different things and refer to her as the b word. It pisses me of to hear him call her those nasty things. When I speak up, he gets mad and calls me weak. He said I'm too weak for him and he needs someone to be strong for him. I understand he is just venting. I listened to the situation, and I told him when he is talking to me, do not refer to your mother as a b****. It is just not right. Now he doesn't want to talk to me period. He told me to leave him alone.