I'm not all that sure it has entirely to do with naiveté, actually. The people I've known who have syndromes and disorders within the autistic spectrum are often quite picky about who they choose, especially if they've learned not to be over-eager.
I, too, vaguely fit some of the criteria and I've always been extremely picky, if not disinterested altogether. Naiveté caused by poor communication skills can obviously exacerbate issues, so I think many Aspies, schizoids, and other PDDNOS' may tend to pick those that seem to understand them best, or that they understand.
It also seems more difficult for autism-afflicted individuals to develop their egos, especially if raised without adequate caring and understanding from their families. I figure that's what happens to schizoids, when in fact they're probably just born very sensitive autistic-types.
With such 'empty' feelings, some may easily fall into a trap of need or desire to be fulfilled by another individual's close presence, be it emotionally, physically, or both. This is a problem I struggle with in my current relationship with a very probable Aspie.
And then it comes down to what is defined as 'normal people'; are we talking about what is most accepted by the general public in Americanized countries, or what the general population presents?
Extraverts are estimated as making up about half the population, a figure that correlates with my own experiences--I've never seen introverts downtrodden for being introverted. If you want to go the way of Jungian typology, roughly 25-30% of the population is estimated as 'Sensors,' while the remaining 70-75% are 'iNtuitors'. The latter are largely considered more strange than sensors due to their relative scarcity and more creative, 'spacey' thinking. Not shockingly most schizoids and Aspies fall into the category of 'iNtuitors'.
In the end I have never met a person who didn't suffer innumerable problems, normal or not.