Most of the nintendo hate stemmed from the gaming "media" with the wii. Before when nintendo was in last place with the gamecube nobody cared to hate nintendo. As the wii became successful the hate grew the media invented terms like casual and hardcore gamers to classify nintendo and non nintendo gamers because 'nintendo is lazy and we don't care' (the real question is why would they do this).
The thing is you only see this hate for nintendo on internet forums by random users and you don't really know who they are for all intents and purposes. In real life I have never really met a gamer who hated nintendo actually quite the opposite, I would have met people who stopped playing their wii though.
I would go so far to say no noe cared to like them either, funny enough when Wii got big all of a sudden Ninty had all these fans. Where were these people when GC was around??
OT hates a strong word and their is probably a handful of people who actually hate the company or system. Dislike maybe better, im in the indifference. I was hyped for Wii U prior to e3 but after what I saw... it was all meh to me, thats not hate, thats just me not caring at this juncture.
@Chark those are all Wii related, they are valid points but doesnt really answer the Ninty question.