First and foremost, it doesn't seem like most Nintendo fans hate Sony (some do) but they seem to dislike the fanboys of Sony. It also seems to me that Sony only fans tend to boast because Sony delivers more often than not compared to the competition. Sony gives them something to cheer about. Sony delivered more first party IP's than Microsoft or Nintendo this whole gen, so if they don't buy the competitions consoles it pretty clear to understand their ignorance or where they are purely spending their time.
On the other side of the coin, Sony needs to choose wisely some of the games they allow to put out. They need to fix their brand image and fix their lineup for the PSP and move next gen.