Well, if you're referring to hate in real life, there's a huge number of factors. People like to be right and attack other things that are different to what they believe. They could also find what you're into disgusting, or their religion is against it, so they fall back on the stance their religion takes. And still others are just jerks who hate on stuff to get a reaction. That's just a few reasons, there are far too many more to list.
If you mean hate on the internet, well, there's the same reasons as above, but mostly it's because a lot of people are internet tough guys. To put it simply:
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