People hate the Packers, Patriots, and others for the same reason people hate Apple and soccer. It's not that the entities themselves are absolutely detestable, but the people who hitch themselves to them make not hating them an impossibility.
Look at the ****ing Patriots fans who infested this place like herpes the last four years. They all acted like the Patriots invented the game. Truthfully, they fell ass backwards into the luckiest pick in the history of organized sports. If you didn't want to flay every last one of them, pour diesel on their exposed dermis and then toss a road flare in their crotch, you're not human.