Indeed, contact with the public will do it quickly.

I work with a long list of clients at my work who seem to lack any type of critical thinking skills whatsoever, a significant fraction of them are apparently functionally illiterate, and a shocking number of them are actually incapable of understanding abstract concepts. These people cruise through life just as happy as you please, at least until they run up against some frustration that they can't understand at which point their default response is typically to get violently angry, and as an outside observer it's equal parts fascinating and deeply troubling. I can't imagine existing that way. Being unable even to read, and with every new concept or technology being an inscrutable puzzle box so terrifying that your only recourse is to scream and tantrum and threaten until someone else comes along and makes it go away.

And yet, most of these same stupid people are highly derisive of smart people. This notwithstanding that without these purported nerds, geeks, Poindexters, and wimps they'd be freezing in the dark as they starved to death. Somehow they've managed to get jobs, afford cars and mortgages, and they're allowed to vote, procreate, and even buy guns. It's enough to make me never want to leave my IT dungeon or, perhaps, never return from the mountains. But I have to, so here I am.

I interact with truly stupid people on a daily basis. I could tell you all some whoppers from my time in the trenches.