A lot of the psychiatric stuff is like that — we know that certain people experience certain things, but the classification of them is very subjective at the best of times.
Both schizotypal and asperger's appear to cause a lot of social isolation, but it seems from my reading just now that it's for very opposing reasons. Asperger's, it seems a lot of the time we just don't notice things. Schizotypal appear to notice "too much", including things that may not be actually there.
This is confusable because one of the ways Asperger's people cope is that we attempt to overcome a lack of / inability to notice things by over-processing them analytically. We're enhancing blurry, noisy photographs and sometimes what we see are artifacts purely of the enhancement process or the noise, to put it in metaphorical terms.
While, according to the stuff I just read about schizotypal, it's more that their metaphorical image sensor is seeing things that might not be there at all, from the beginning. The erroneous artifacts are not there from over-processing, but are there from the beginning.
A brighter future for a darker age.