They are 14 year old playstation fanboys, who have a religious devotion to their console brand of choice. This stems from the teenage search for identity. Having made violently strong cases for their favoured console in arguments with their friends at school, they are now ideologically wedded to this position and unable to deviate from it one iota for fear of the inconsistency being seen as weakness, and more importantly, of it undermining their own fragile sense of who they are: a Playstation Fan.

It's basically a microcosm of partisan politics. Don't worry too much about it.

EDIT: Alternatively they could be very lazy astroturfers.

EDIT2: The comparison of console wars to partisan politics has raised another question that I've never considered before: what will happen in a few decades time when the children of people who have themselves been gaming since childhood reach their teen years? Will we see similar patterns to politics, where children tend to inherit their views from their parents without question? Will parents war with their children over their opposing views on gaming?

"This family has played nintendo for four generations! I'll be damned if any son of mine is going to play an xbox 1080 under my roof!"