If your mother was foully rude to your partner (and I mean horrendously rude for no reason. A total character assassination) would you carry on having contact as normal or say enough is enough that she can’t treat your partner that way and expect things to carry on as normal ?
I think this is probably narcissistic personality disorder ? (MIL) I’m unsure but she truly believes she can do and say anything to me and it won’t and shouldn’t affect her relationship with dh ???!