fiat currencies that non-techies do use are also artificial constructs. There is however the gold bars in federal reserve/national bank myth so the fiats appear as non-artificial to many people. Possibly that makes the difference. Or, more likely, people use fiat currencies since forever and don't really think about that.
I believe more "the thing that exists for ages and I'm familiar with" vs "the new thing" thing.
Anyway I'm not trying to invalidate your point, my experience with talking to non-techies about cryptos is more or less the same as yours