It's just a tragic facet of the human condition - a tribal instinct that can pit friend against friend and brother against brother. Catholic v Protestant, Sunni vs Shia, Spectrum v Commodore 64 and now - perhaps most bitterly of all - Xbox 360 v PS3.
This latter conflict is currently raging between the HTML tags of review aggregating site Metacritic. Trouble started when LittleBigPlanet seemed to have an unusually low user rating - currently at 6.4, compared to 95% approval by 'real' critics.
It soon became apparent that Xbox fanboys had been posting deliberately low user ratings to spite the PS3-touting infidels. The PS3 nation was quick to respond with an equally daft Gears of War 2 review bomb that has left the Xbox shooter with an embarrassing score of 2.8 at time of posting.
UN Peacekeepers are on standby.
PS3 Fanboys Strike Back: [Ripten]