With that said, due to my exposure to autism through my sister, I have seen cases that are far worse than hers. Completely non-verbal people with autism, those who experience panic attacks when they see an unfamiliar person, the list goes on.
We tend to focus on the lighter end of the spectrum, where people can lead functional and fulfilling lives. Most people don't see the other side of the spectrum, where autism is devastating to every single person involved.
There's a form of survivorship bias here: the greater the degree of impairment, the less broad social contacts the person is likely to have, so on average most people's experience is going to have people who have less severe impairments overrepresented compared to their relative frequency among those with the diagnosis.
And I'm sure most people that think about the issue recognize that on an intellectual level, but it's still difficult to tune out the effect that has on one’s “gut feeling” about the subject.
That part is absolutely true.
> ASD should be prevented medically.
But this part (apart from the fact that it's not currently feasible) is just too categoric. I certainly know several autistic people who would prefer to get rid of their autism, if given a choice. But I know plenty on the milder end of the spectrum who would not — e.g. because their distress in social situations is outweighed by the benefits conveyed by an increased ability to focus.
His diagnosis didn't feel like a social judgement. The impairment literally killed him even though he wanted to live.