I'm pretty bad at this once ruled out a church as my new regular one because someone misheard my name & I couldn't correct her but DH is jaw-droppingly polite. Every time we saw FIL for about 2 years he'd tell us about a situation in their village, who'd said what, why he thought they were wrong, etc. Every time there would be a small development to update us on but FIL seemed to forget he'd told us any of it & start right from the beginning. DH would nod along as if it were all entirely new information so I felt rude interrupting. I once asked DH why he didn't just say something like "yes, last time we saw you X had happened, what's been going on since?" & he said he didn't know! It just seems to be the thing to do in their family once FIL starts talking to just nod along without commenting or asking questions.
The meat-eating vegetarians are reminding me of the episode of Friends where Phoebe meets Mike's parents. Couldn't find a clip but did find the script...
Phoebe: Oh God! Is that veal?
Mike: Mom, I thought I told you... Phoebe's a vegetarian.
Bitsy: Oh!
Phoebe: Oh no, no, no, no... That's okay, that's okay... I mean, I'm... I am a vegetarian... except for veal... Yeah no, veal I love...
Mike: Phoebe you don't have to eat...
Phoebe: No, no, no, I actually it's any baby animals: kittens, fish babies... You know... especially veal... and this, this nice vein of fat running through it... (she cuts the meat, picks it up with her fork and holds it in front of her mouth, which she keeps closed, trying to overcome her vegetarian thoughts... and... puts it in her mouth... Clearly not enjoying the meat...) Hmmm... yummy (everybody seems okay with it, except Mike. He's making a hmmmm.... face... Then Phoebe swallows it) Hmmm... (at first she likes it, but then, in an instant puts her hand in front of her mouth and runs from the table. You hear a door slamming.)
I think of that scene regularly when at PILs. They'd distinctly more upper-middle-class than me & I only eat chicken & fish but they like a much greater variety of meat. To her credit, MIL did try for the first few years but seems to have given up now. I just insist I have a small appetite & take a suitcase full of snacks. I think she's knows this.