I read this as "anything can be used as evidence if it confirms my preconceived notions". Your anecdotes about a friend or two are just that - anecdotes.
This claim of "a single man could feed a whole family on one factory job" is misleading and untrue. It's usually the 1950s that people claim this was true and they wish we could go back to the 1950s. It's easy to show that that the 1950s were no picnic (https://archive.is/oH1Vx).
It's always some time in the past that the nation was great. They pick 1950s, you pick the 1990s. What you don't understand is that people are usually longing for a time when they weren't alive or when they were children. They want to go back to living the stress free life of a happy childhood, when your parents shielded you from all the vagaries of life.
You cite cartoons, they cite memes. If you ask them how a meme could possibly be used as evidence, they say much the same as you - anecdotes about their grandparents.
