I frequent a few sites and it's universal - PS3 fans tend to be very passionate and vocal - and annoying. I also think they are the most defensive - they can not stand *bad* news, even if it's the MSM reporting it. 360 fans can be annoying, as well as Wii fans, but not to the point of PS3 fans, thumping their chests hard when their console does good for a few weeks.
Don't believe me? Look at the folks who are permabanned or banned. There are a few Wii and 360 posters, but most tend to be PS3 owners. And the ones circumventing the bans? PS3 users.
And trust me - it's not just this site - they are all over the place. I like my PS3, but I'm not as devoted as these folks are. It's almost like some of them are in a cult.
360 fans? What do they brag about - how often do they create a gazillion threads about an exclusive? There are some, but not as much as Sony fans.