Christ, Phil barely even qualifies as human, anymore. He's so far detached not only from reality, but from the rest of the species, that he's little more than an insect wearing a decomposing flesh suit. There've been documentaries made about the negative side-effects of near-total isolation in human beings, and the case study done of Phil will serve as his sole contribution to the human race.
People's behaviors are at least partly regulated by society. We know what behaviors are appropriate and inappropriate based on reception from our fellow man. You don't just start screaming bloody-murder in a crowded restaurant because that disrupts other diners, who will look at you in annoyance, resentment, or even hatred. Having a goddamn 8,000+ page thread devoted entirely to your fuck-ups and shortcomings as a person would make any halfway rational person take a step back and reflect upon their life choices up to that point.
But Phil has almost completely quarantined himself from social interaction. The only opportunity for regulation he gets comes from either yes-man paypigs, or mentally-stunted outcasts. And even then, ranting to a fucking chat box he moderates with more heavy-handed censorship than the Chinese government hardly qualifies as interaction.
I don't know where or how this all started - if his parents are responsible for it; his worthless 4th Place "victory"; his sudden YouTube fame; or if this is just how his brain is naturally wired, but Phil's refusal to question, to reflect, or to just look in a goddamn mirror ensures that he will continue to deteriorate until he finally kicks the bucket.