IMO, people hate Apple because of its clear corporatism that is based upon trying to shark consumers with fancy ads, offering literally zero customisation options (you can't even change your own battery), and the fact that the system is completely locked down (unless you jailbreak). Not to mention, Apple consistently tries to ensure you cannot jailbreak. It would be like a PC manufacturer forcing you to use Windows even if you didn't want to. Just because you don't have to buy something doesn't mean what that company/entity is doing is agreeable. If you didn't voice your opinion about matters the status quo would never change and we'd all have the stigma and stereotypes we had a hundred years ago.