Here's a thesis. Being gay and being an "Aspie" are both under the control of a large number of alleles of small effect.
In the 'gay' case, less means a sympathetic, empathic personality; in the Aspie case, less means a focused, dispassionate and logical intellect.
In both cases the full deck decreases reproductive success while a partial hand can enhance it.
Perhaps Asperger's syndrome is the gentile equivalent of Tay-Sachs disease and similar neurological collateral damage found in Ashkenazi Jews under selection for systemic, analytical intelligence in the mediaeval middle classes.
World Cup: England loses to Uruguay. The English looked hard-working, stolid and flat-footed ; the South Americans (of Mediterranean lineage) were dynamic and explosive. What do you think, agrarian farmers vs pastoralists?
Once you get your eye in, genes are everywhere!