1. While he may suffer from many disabilities, there is no reason why he can't control himself and keep himself from acting like a dick online (We can only assume he was behaving inappropriately). He may have severe OCD, but I don't see how that lets him act like a dick (again, assuming that's why he was banned)
2. There are plenty of other social sites that are not PSN where you can communicate online without crowds.
3. First Amendment bullcrap argument again. You signed Sony's Terms of Service, they are a privately owned company, centered in Japan no less, therefore your American rights do not transfer online. Not to mention screaming profanities (again again, this is the easiest thing to assume) kind of abuses your 1st Amendment rights. Your rights end where mine begin.
While I sympathize with him slightly for his disabilities, that's obviously just a trick to gain sympathy from the Jury or Judge or whatever. Pointless lawsuit is pointless.