Honestly I think fanboy-ism was worse/more intense during the SNES/Genesis or PS1/N64/DC days.
Today many people own multiple consoles. I know plenty of people who have all three actually.
In the SNES/Genesis days it was like US/West vs. Russia/East, lol, it was like a whole different world. And all the sniping was even right in the advertising "Sega Does What Nintendon't", Nintendo ribbing the 32X in their DKC ads, etc. etc.
Back in those days it was more personal, because gamers were mostly in their adolescent/teenage years where they could only afford one console as mommy/daddy would be buying it for them, so once you picked your side that was it, lol. You made your choice and now had to defend it to death.
Also the original article is fanboy-ish in itself. The author is ripping Sony's E3 presentation rather than "focusing on the games" (of which Sony showed plenty) and trying to convince his friend the Vita is doomed. I mean c'mon.
Maybe he should take his own advice. Anyone else see the irony in him arguing against "fanboy-ism" when he then proceeds to shoot down his friend for enjoying Sony's E3 event? What's wrong with his friend being excited about Last of Us, God of War, Beyond, Playstation All-Stars Battle, or (gasp!) even Wonderbook (getting something exclusive from J.K. Rowling is pretty noteworthy)?
How many platform holders are giving their platform this level of support in year six? Nintendo sure as hell isn't with Wii, and Microsoft isn't with the 360.