Why is it that once a mother hates the child's partner, she's unlikely to change her mind?

[Anonymous]

Ex 1: My mother hated my 1st boyfriend till the very end. She was right the whole time.

Ex 2: My cousin's MIL kicked him out of the house. My grandma and other relatives thought he had reconciled with the lady and that he won her over. Nope. He never won her over. She hates him (he isn't a very good person) and was only trying to get along for the sake of her upcoming grandson.

I've heard of this several times too. Once you get on the bad side of a man's or woman's mother and/or she talks garbage about you to others, that's it. She already made her judgement and unless you saved her own life or she saw you saving her child's life, she'll never really like you. If she apologizes or suddenly reconciles with you is usually only for the sake of her child or upcoming grandchildren, not because she really means it.

Why is it that once a mother hates the child's partner, she's unlikely to change her mind?

Updates

+1 y

My mother likes my 2nd (current) boyfriend. That's the only way someone wins over her... she would have to like the him from the start.
There is no ''My partner's mother hated me but now she really loves me'' fictitious stories. Rarely. Usually she either likes you and you're welcome or she doesn't and you'll never be good enough.

[Anonymous]

"My mother hated my 1st boyfriend till the very end. She was right the whole time.".

This. Not always, but many mothers understand right away if someone is good or bad for their children. Sometimes they are wrong or have the wrong reasons, but most of the time they are right. My mother is not... a easy person. We often had a love-hate relationship starting from my late teens to around 22 years old. But she always candidly predicted things about my girlfriends. First one, she said, looks like she'll try to kill you. And in fact, she tried to strangle me one night.

Second girlfriend, she predicted, is sweet but will cheat on you. And cheating on me she did. Third girlfriend, she said, you will marry her and she's right for you. And married we got.

[Asker]

Interesting. I've been now dating my 2nd boyfriend (current relationship) for 7 months now. This time my mother likes him from the beginning. She's predicting it'll lead to marriage and she would be happy for him to be her SIL (son-in-law).
Unlike the 1st relationship, she already knew he would never propose and was wasting my time.

[Avicenna]

Because people are stubborn

[Asker]

True. Once my mother hates someone there is nothing they can do to change her mind.

[Avicenna]

There you go...