Their DRM and rootkits provide ample grounds to passionatley hate Sony, and I do. However, these aren't the entirety of the story, and its more than just this that we hate them for. It's also the fact that they seem to hate their paying customers and operate in their own parallel universe. Proprietary connectors, feature lockouts, unfriendliness to people modding the equipment that they have bought, radio station payola, and an incessant drive to establish their own standards rather than use an industry standard unless it's so entrenched they have no point.
Case in point, work gave me a SE phone recently (not one that I would have picked myself - I buy *nothing* with the Sony name on it, and haven't since I inadvertently brought one of their DRM-crippled non-CDs in 2003 and couldn't transfer it to y media player). Anyway, superficially it's a nice bit of kit. However, when I go to upgrade the memory it won't take any of the industry standard cards that I already have - oh no, I need a Sony brand "pro duo" stick that no one else uses, can't be used in anything else, and mysteriously costs about 2.5x normal on a $/GB basis. Then I go to plug headphones in so I can listen to music, the phone has a headphone connector, but instead of using a standard 3.5mm jack Sony have gone with 2.5mm, which you can't get in this country - not even the damn Sony store has them.
Then their is the gross hypocrisy a few years ago when the head of Sony music in this country was also serving as the head of the RIANZ (our equivalent of the RIAA) and issuing hysterical media statements about how anyone who format a CD that they purchased to an ipod or music jukebox was "stealing" and should and would be prosecuted. Funnily, at the same time, Sony was selling a hard drive based jukebox that let you do just that - and even had pictures of the shelves of CDs you could transfer hand have available at a push of the button in the window of the Sony dealer in the CBD as advertising. Presumably, Sony didn't then prosecute themselves......
Personally, I think that Sony is over large, arrogant, and severely ethically challenged. I go out of my way to avoid them, ensure that tender bids featuring Sony equipment (eg laptops) don't succeed when I am charged with evaluating them, and dissuade friends from buying their kit. Also, other than for their top line gear, the manufacturing has been moved to China anyway, and quality is no better that kit selling for half the price. I took great pleasure in refusing to support short-listing a bid to supply a fair number of Sony laptops in response to a tender last year, so at least I get some satisfaction along the way .....