“We had a lot of margarine growing up because it was cheap, but by my teenage years we could afford butter, which is a massive upgrade.”

My experience was similar. Weirdly, it makes me sort of grateful for growing up in poverty, because there’s so many things I got to try as an adult that were huge upgrades, like you describe with butter. The biggest example I can think of is actual parmesan cheese — it blew my mind when I first tried it.