Sadly, that might be true for about 50% of the country. I have relatives that love canned string beans and think fresh green beans are weird. I can eat canned veggies but fresh is so much better. A little olive oil and/or butter, and salt, roasted or pan fried is delicious
My mom cooked sweet potatoes baked in foil, but at the holidays the yams were in a sweet syrup. I usually tried the sweet ones, but never ate them. We never had the marshmallow dish. We only had marshmallows for camp fires.
I didn't grow up with a lot of casseroles. But we had fried chicken more than anyone that I know. Simple flour, salt, pepper, punch of garlic powder, Wesson type oil. It was good. Mom could have opened a fried chicken restaurant!