If anything, I would say I side with Sony over MS.
Regardless, reasons why I dislike Sony would probably include:
They are pushing the gaming industry too fast in terms of graphics, which tends to force compromises on things that I like, battery life of handhelds, longevity and low cost for games etc.
In my opinion, if Sony were content to let graphics advance at their natural rate, they would be a more admirable company.
But hate? Aint no-one got time for that.