Not to burst your bubble professor, but if only 5-15 percent of people do not have what you call RAD, then aren't THEY the ones with a disorder?
85-95% would seem to indicate the normal human condition.
Now that your theory is completely debunked in one paragraph, let's get back on topic.
Even if 99% of the population were seriously autistic--that would NOT mean they were "normal" in any healthy sense of the word. Statistically the average does NOT always mean healthy or normal in qualitative terms.
You know that, silly rabbit.
OK, We now return you to your normally scheduled OUTER LIMITS.