Come on... of course you could argue that all humans are mentally ill to some extent. But Arrington's behavior is easily within the realm of acceptable social behavior, even if he does like to cause minor controversy.

However, death threats and randomly spitting in someone's face are unambigiously crossing those social boundaries by a wide margin.

Arrington is a pathological narssicist.

I'm not remotely surprised that he's pissed off other crazy people enough for them to get retaliatory.