Well, it's kinda like how people are with sports teams. People like to root for their favorite team while wishing the other teams fail or at the very least doesn't beat their favorite team. It's really not that difficult to understand. Some people just make it more personal than others.
In all honesty, I kinda like the console war. I like rooting for my team and I like that gamers are so passionate about it. Should I like or buy another console when I have little to no interest in their game library? Should I buy all 3 just so I can say that I'm not biased or picking a side? I don't expect anyone else to do it.
In spite of what some (nintendo) might think, sony and microsoft's consoles have differences between eachother. Their game libraries are different from eachother. MS has more shooters and caters to americans' taste the most. Sony has more JPRG's and tries to have games for everybody.
Their company policies are also different and both are trying to make their respective console the "go to" machine for entertainment in different ways.
