I feel the opposite. How hard it was to be pregnant and taking care of young children and waking up several times a night for young babies? All for your child years later to sum you up with a negative word. Ungrateful for the majority of people with negative words (there will be a small percentage of exceptions).
It depends what your mother has done to you, do you think Rose West's children think she is an angel?
Karen Matthews?
Tracey Connolly?
Not all mothers are good at being mothers.
Not all mothers even try to be.
Don't judge people because they don't like their mothers, have found them abusive or fear them.