80s in California... there was a sizable but not exactly large group. No one cared. We all knew "old people" were supposed to care, but it was more likely just a thing everyone had to pretend to care about on TV. None of the old people I knew cared either.
Being nonbinary is kinda unusual, but it's also probably something that's super easy to be closeted about, if you don't know how people will react.
I mean in the 1980s I thought all 900 kids in my high school were straight, and that being gay was super uncommon.