When we visited our maternal grandparents back in the 50s and 60s there was always tripe, brawn, black pudding, kidneys, liver, heart, pig's trotters, cow heel, salt fish and other such 'delicacies' on offer. I wouldn't touch any of them and I still won't! We moved away for my dad's work and I know my mother was very nostalgic about such food but she never had them unless we visited (except for black pudding which she craved and bought from Debenhams delicatessen, eating it cold on the way home!)
I've also never eaten king prawns, octopus or squid, crab, oysters and most other shellfish, locusts, vs' legs, witchetty bugs or mopani worms. I have eaten scallops. They are fine. I tried lobster. Not impressed. It's very much overrated. I ate a snail (not in shell) and it was OK but I wouldn't go out of my way to have another. I tried a mussel. It was pretty disgusting.
My self imposed meat rule is four legs, two legs (poultry) or no legs (fish). I'm not looking forward to a time when insects are the only form of animal protein! That's when I'll be vegetarian!