He PM'd me once and it was decently coherent. I'd say what he does is at least partially a gimmick.
If what you're saying is he writes like that,
on purpose, because he thinks it makes him sound cool rather than writing that way involuntarily because he is as addle headed, retarded and dysfunctional as it sounds, I can believe you.
...but if you're implying that he is somehow less socially retarded because he does it on purpose rather than involuntarily, I would have to laughingly disagree.
Can you see him pulling this cool talk gimmick on a woman (or a man, I don't claim to know his preferences)? It wouldn't matter if he did it voluntarily because he thought it would be a cool gimmick or involuntarily because he has significant brain damage, at the end of the day he would be just as alone and unsuccessful either way.
It's like if a skinny, rich, white kid from the suburbs all of a sudden starts dressing like a ghetto wigger and all of the other kids start laughing at him because he looks like a giant tool. Have you really done that kid any favor by saying, "He doesn't dress that way because he is brain damaged, he really does know how to dress like a normal human being, he just does that as a gimmick because he thinks it makes him look cool."