There are always going to be genres out there or popular books or films that people really hate not appreciating that it wasn't aimed at them in the first place. If you find yourself hating a really popular book or film that has captured the imagination of a segment of the market, ask yourself if they could make just as many valid criticisms about your own favourite book or film.
Twilight is aimed at teenage girls. Fifty Shades of Grey is aimed at more sexually mature women. You can make just as valid criticisms about Hollywood films, action thrillers or superhero comics for example but they are aimed at a completely different audience. Often the product can be poor quality if it's designed for one particular purpose, for example Fifty Shades of Grey is meant to be erotica. It has obviously worked though otherwise we wouldn't be hearing about it.
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.
Maturity is about recognising that everyone has a different background, different needs and values, that people think differently and that you cannot judge purely based on your own particular life.