What a bunch of baloney! A disorder where someone can't communicate well with others and you're intelligent AKA a nerd? What's next, a disorder where people are just stupid? Oh they call that intellectually challenged! My bad!
People who can't communicate well with others become that way due to forced isolation from either others or themselves and this usually happens when they are children. The mind is pretty malleable in general, but as a child it is extremely malleable.
For instance, you get a kid who plays the violin a lot when other kids were busy playing with toys, that kid could grow up to be a virtuoso. Maybe a boy spent their entire childhood digging sand, hell he'll be a great landscaper when he grows up!
You can even look at the opposite, say a child never skates his entire life and then decides to skate as an adult. Well he's gonna be a pretty crappy skater and it's probably going to take an extreme amount of practice to even be passably decent.
So if you take that idea and look at a child that never socializes while they're young for whatever reason. Well when they grow up they're gonna end up being socially retarded, it doesn't take a rocket scientist to figure that out.
Of course, genetics play a role and you could genetically be more likely to become a nerd, psycho, whore, whatever. However, in the end it's the environment that will ensure whether that genetic switch ends up being turned on or not.
While psychology is good for understanding why someone behaves a certain way. It's still not an excuse to continue acting a certain way. The human mind is malleable even as an adult though not as much as a child or teen. If you're deficient in an area, work at it until you're passably normal.
Though of course there are some rare people that are beyond hope.