No, you just don't understand it yourself. Many social quirks and awkwardness is because of these sorts of abnormal thought patterns that make people arrive at weird conclusions. They are in fact, an important part of diagnosing autism vs scizophrenia and many other mental disorders, as in some situations, these weird conclusions can make someone seem pretty loony, or make them shut down socially when they realize they've misunderstood. So you being offended by this explanation just means you do not understand nor empathise with autistic people.

I'm not saying these are the only things that make someone autistic, or that all autistic people will have such peculiar trains of thought. Just that it is common in the realm of such disorders. Autism is a MASSIVE spectrum, because it describes symptoms, not causes.

So while this type of behavior might eventually get fully separated from autism in to things like social communication disorder, that's more of a consequence of psychiatrists/etc slowly picking appart that massive umbrella of "autism", not that it wasn't or isn't currently part of it.