Being taught to cook involves more than just putting something in a pot or pan. It starts with knowing when food is ripe and/or fresh. Why there are so many different cuts of meat and types of bread and cheese and why some things go together and some don’t.
It also involves knowing which vitamins and minerals are in which food and which of those break down during heating and which ones should be cooked to give a person the best benefit for their health. If a mom (ideally) or a dad knows these things because they were taught them, then it is very painless to teach it over the course of a childhood.
As some posters have said they didn’t learn the easy part (putting food in a pan and heating it)until they married, so unless they are dedicated to learning the other stuff and simultaneously teaching it to their kids, the next generation will grow up knowing less.
My mom didn’t garden, so I didn’t learn it. Starting from scratch, at my age, to learn backyard farming is overwhelming to me.
I, however, am the lazy American about which we are talking. I still sew; but I seldom really cook. At the end of my workday, I'd rather drive-by than cook. It was, however, fun when I had someone to cook for.