Well, back when I was a kid, 'autistic' meant, 'screaming and flapping your arms when somebody turned on the light wrong.'
"Rain Man" was a movie about what was, at the time, considered a high-functioning autistic.
Most of what we would nowadays call 'ASD' was just 'quirky' or 'weird' or 'shy.'
Go find a copy of the 1980s nuclear war film Testament. Watch the scenes with the sons. One son, the youngest, has several scenes with things like 'running the TV, a radio, and a record player at the same time,' 'being told that he can't only eat bananas,' 'wearing ear muffs at the dinner table' and so on.
Nowadays, that's clearly stimming, sensory restrictions and ARFID, and probably ADHD, and he's be labelled 'AuDHD'.
Back then? He was just being a kid.
But nowadays, 'doesn't look people in the eye "enough"' means you're ASD, and 'looks people in the eye *too much"' means you're ASD.
Given that we don't even know what 'Autism' is, we ascribe way too much to it.