High functioning autism exists, but autism in general doesn't seem to give any advantage to general intelligence. And the low end of functioning in autism is really, really low.
It's a rare breed (1-2%) of the population that will actively push back, insist on facts, and stick to only the "hard, unyielding reality" of physics, chemistry, mathematics, physics, logic, etc...
There is a very high correlation between these types of people and autistic people.
You have to not care about how other people "feel" or what their conflicting priorities might be to prioritise reality above the personal whims of others.
To be truly intelligent, you have to be able to call the emperor naked.
PS: It's easy to disagree with the above, but this is invariably an instance of "the fish is the last to know it lives in water" idiom. Something like 80% of the adult population goes along with Santa for Grownups because of peer pressure, also known as "mainstream religions". Don't get me started on partisan voting against one's own interests. Etc...
I have a strong suspicion that autism is a case of too much of a good thing. Things like being a carrier for Tay Sachs confers a survival advantage but two copies is lethal.
Also known as the backfire effect, where people will paradoxically believe in a false position even more when presented with the contrary evidence.
There are anthropological explanations of this, such as wanting to remain seen as being loyal to a "social group" by publicly and visibly rejecting the behaviours or positions of a rival group.
There are many real-world examples of this, such as immigrants become more religious as a way to distance themselves from the dissimilar mainstream religion of their new home. Back where they came from, there was no need to "show off" their adherence to their faith because it was the default state and everyone was the same as them. But when faced with dissenting viewpoints, they feel a need to demonstrate their loyalty.
There are similar effects with sports fans that move locations, conservatives that move to very gay-friendly areas, etc...