We live abroad and I haven't seen or spoken to my MIL since 2008 when she came to stay for 2 weeks.
She left after a week (thank god) as there was nothing to.
Husband told her AT LENGTH prior to her coming that we would be working, the bus service into town is rubbish, that there are no shops or markets nearby and not much to do except relax.
She sat on the sofa in her dressing gown every day with a cats bum face because she was bored.
Husband goes back to visit once a year and I stay home. I have no interest in seeing her.
When we first got together she hardly gave me the time of day and used to look me up and down critically. I think she thought my skirts were too short and that I smoked and drank too much.
She's also incredibly manipulative, playing her other children off against each other. She tells some incredible tall tales as well.
On the other hand, my Mum lives near us and we see her a lot. My husband finds her annoying, irritating and needy.
As soon as she opens her mouth I can see him eye rolling.
She can be all these things but I just let it go over my head.
My Mum used to be really hard work, especially when she'd had too much to drink and my husband can't forgive or forget those times. She said and did some quite nasty things in those days.
She doesn't drink so much now but he can't get past it.
He ignores the many kind things she has done for us and fixates on the past.
I think it is as PP said, you tolerate more from your own parents.