Well, if you're on the autistic disorder spectrum, you have better cerebral capacity in visualizing abstract things such as chessboards and the movement of pieces. However, if you're high up on the spectrum, you might have trouble communicating this capacity. To neurotypicals, people like this may seem "crazy" unless their condition is explained in detail.
Insanity and chess ratings

That was an interesting interview. Thanks for posting it, Professor:)
You are welcome...

This whole line of reasoning, this thread and everyone who's posted before me are obviously crazy. Therfore, I must be sane for replying. It's when I *leave* this thread that I'm in real trouble.

Definitely, when somebody judges another person insane. It could also be a judgement made by a group or society based on a behavioral deviation from common social ettiquette and social values:)

Or based on the subject making threads like this one: http://www.chess.com/forum/view/general/do-chessplayers-get-laid
That was an interesting interview. Thanks for posting it, Professor:)