@MotherDucker
No, not for everyone. My mother has great relationship with my husband (and with my ex she also did). And I have horrible relationship with my MIL (to be fair, she has horrible relationship with my husband/his son too). With my ex-MIL we had mutually neutral.
So, I'd put my money on a concrete thing that he didn't yet speak about by some reason.
@rakshy he dropped us off at my parents Monday evening. Mom had made dinner for him, asked him to eat before he left and that was asking too much. He always cites work stress as a reason... But he's never that stressed about work unless family is visiting or he has to interact with them.
Sounds like it's less a problem that he doesn't like your Mom than that he is stonewalling when you want to find out the reason.
@MotherDucker
it looks too me like you need to have a honest talk with him. including talking about how that all makes YOU feel.
please, consider a mediator (priest, counselor, whatever will work best for you two)
@rakshy we're in different states. It's not like my parents drop in unexpectedly. We see them a handful of times throughout the year, and any more than that it's just my daughter and me. The last time my mother came to our house, he shut himself in his office and stayed there for 2 days. Barely even coming out to eat or use the toilet. It was so humiliating. He doesn't even bother to pretend for my sake. When there is no mention of extended family, we're good. Almost normal. Apart from anxiety.