Their reason : The boxsets.
Twilight boxset: modern elegant clean cut fancy to the point
Harry Potter boxset: well excuse me I was not aware we kept books in fr*****ing treasure chests r we pirates now??! Or other things that don't exist like WIZARDS? OMG dumb ppl believe in magic omg to much

Firstly, the way it is packaged doesn't matter in the slightest. What matters is what the book is like and how it is written. Secondly, Wizards do not exist I grant, but do vampires? Werewolves? Last time I looked, it was a fantasy book. Please, if you want to insult a book, come up with better reasons you can actually stand on. And we "dumb ppl" do not believe in magic too much, we just posses the skill to be lost in a good book, to imagine ourselves in Harry's world. And if you haven't noticed, the whole book is about the wizarding  world, so yes there are wizards, and also your fair amount of magic.