Besides all of the above, I would say that many are following corporate PR (or going against it depending on how it struck you).
Going back to the 2006 E3, you had statements from Sony that were pretty arrogant. 'Get a second job', 'doesn't need games, people will buy it just to look at it', 'price should be higher', etc. As well as their remarks about the Wii.
Microsoft took a different stance with the Wii. Coined by Microsoft’s Peter Moore, Wii60 was the idea of buying both the X360 and the Wii for their different game play.
That attitude seems to have carried on, even at this site. You see those favoring PS3 lash out at the Wii or X360, and those two lash out against the PS3. But less often do you see Wii supporters and X360's attacking each other.