I don’t think anybody actually hates them…that’s a bit strong. But yes, they are the butt of many jokes. Why? So many reasons, but mainly the attitude that is associated with many hipsters. They are often extremely pretentious and can be very “holier-than-thou.” I know several people who fit quite well into the hipster stereotype, and I have to say that they tend to be annoying and try far too hard to be just like Zooey Deschanel, though I certainly don’t hate them by any means.
Then, there is the hypocrisy of hipsterism that is constantly made fun of. Despite trying so hard to be “ironic” and different than mainstream society, they all somehow manage to listen to the same music, have many of the same characteristics, and look exactly the same.
Of course, these are generalizations and not all hipsters are like this. And really, the line between hipster and average citizen is blurred because you’re not a hipster if you admit to being one.