I agree with Manunited, in that we shouldn't get all worked up about something clearly off-topic. The sole point of this thread is in the subject heading: "Why do Nintendo fans hate Xbox so much?"
My answer is this: Xbox has become a thorn in Nintendo's side. It is the kind of success story Nintendo has hoped to achieve for decades, and one that ends up working not for the Big N, but for a newbie. Microsoft is the biggest software corporation in the world, and has more money to burn on the North American market than Nintendo and SCEA combined. This is a worst-case scenario for Nintendo, because they cannot compete with Microsoft. Nintendo has developed a reputation of being family-friendly and very respectable. Nintendo has ended up with the most difficult-to-please userbase: kids. Microsoft has access to the hip, the trendy, and the informed. Together, Microsoft and Sony has all but devoured the 18+ market, leaving Nintendo with a demographic whose parents are still having suspicions about the affect videogames have on their children.
The Big N is suffering because of Microsoft's success. That is why so many Nintendo fans are getting upset. They want to see Nintendo regain its former glory, but meanwhile they have this big competitor with deep pockets threatening to oust the house that Mario built.