Culture changes. Witness the folks who grew up thinking of themselves as "good eaters" who never wasted food during the post-war rationing. They do not see themselves as fussy, their parents did not, but their adult children castigate them for their inability to eat curry and similarly untraditional types of food. The same could happen to people of our generation who identify as unfussy on this thread. It just needs something foreign and new you're not familiar with to become hugely popular with the next generation, doesn't it?
You've described my Mum SpinDoctor, except she never castigated us or made us eat everything because she'd grown up in wartime - 'clear your plate, grumble, grumble.'
My SIL called us 'Mary's caff' in wonder because my mum would cook separate meals for anyone who asked. That was up to my mum.
Once rationing had ended she stuck to her traditionals but embraced the wealth of food and saw no problem with convenience food.
There were things she wasn't used to eating and things she was that my '70s friends found very strange - rabbit, for instance. They thought it was cruel. My friends' parents were much younger than mine and this was the '70s, the era of Findus Crispy Pancakes which we also ate. She could never get her head round Smash though. I am grateful for that.
My mum's most abiding fear was anything identified as French food, particularly horsemeat.
A few things going on there. Very strong propaganda about how the French had 'surrendered' to the Nazis and Britons should be proud for holding out, but also a real fear of being starved out by Nazi blockades and of food adulteration.
As I said, we ate rabbit but she always insisted on buying one with its head on because the bodies of skinned rabbits and skinned cats look remarkably similar and it's not a good idea to eat a carnivore.
This happened.
She cackled with glee that during the horsemeat scandal, Iceland - that she was fond of - came out tops for non-horsemeat lasagne whereas Waitrose fared less well.
Not that she'd have eaten lasagne.