So if you find yourself hating any of these books or films, you may argue that you hate what they represent. But if you think about it, doesn't that mean that you are in effect also hating the intended audience? After all, the books and films are designed to appeal to something fundamental about the audience's psychological character and doing it rather successfully.
I have no idea how you come to this step and it seems like a defensive knee-jerk, except you haven't read the books apparently so I'm not sure why it would be that so I'm confused :P
But regardless, while there are many people who unfortunately cannot dissociate criticism of things they like from criticism of themselves due to how much they're invested in it (whether it be sports teams, video games, television shows, or whatever), there's no connection between simply criticising something and disliking the people who do like it. I mean, I dislike stuff people I love like and I obviously don't hate them, and I'll even openly mock how terrible stuff
I like is. Now, granted, if the criticism of this book is "people who like it must be stupid," then yes I can see where that'd be problematic, but simply "this thing is terrible for reasons x-z" is criticism and if you don't allow criticism of fiction then something's wrong.
I haven't read 50 Shades but most of the criticism I've seen has either been shock of "something this bad shot to popularity out of nowhere so quickly" or the more important "this book has a damaging message".