Perhaps I do. See, I keep gaining weight. Now, I'm not huge, but I weigh more than I feel good weighing, and I just keep gaining. I basically eat rice and vegetables (GFCFSF, low sugar, no dyes, no HFCS), and not a lot of those, and I still gain. I exercise; I swim, I walk... I gain.
And the doctors? They just say, "Eat less. Exercise more."
And when I listened to them over and over, I was eating 100 calories a day and running 15 miles a day, and ended up hospitalized three times. It's true. But still, I was "overweight."
If one more doctor tells me, "You're fine. Fat, but fine," I think I'll totally lose it on whomever that doctor dares to be.
So, yes, maybe I do understand your frustration.
That said, why not take strategies that help people with autism and use them?
Why not be satisfied to identify with being on the broader autism phenotype? Affected, but not diagnosably so.