almost out of my thirties, consider myself perpetually interested in chasing and studying rationality for the last 25 years or so, and consider most of the population certifiably insane and I'm an alien anthropologist ferrying between mental institutions.

It's not all bad though, on a lot of the empirical economic work I've done a lot of people appear what I'd call "weakly locally rational": a rationality effect seems to effect people in aggregate and determines the direction they move, and tends to be the biggest effect, though the aggregate doesn't move perfectly in accordance with what rationality would expect. It also depends very much on framing: they are "locally majority rational" in the context of their frame of reference, but not in terms of the macro-world: which makes sense, because we're finite creatures who can't actually take in all the information, have limited processing ability, and each have different access to information and historical experiences. so most of us do the best with the limited experience of what we got and how we understand the world.