One of my buddies has a theory and I am pretty much in agreement with it. You tend to like the music that you listened to in Jr. High and High School. For me personally that fits the bill. There have been a couple of bands that I have found out about more recently that I have liked, but the majority of the music I listen to was the same kind of stuff I listened to during my late teens.
Music is music. You like what you like and don't like what you don't like. To me the title of this thread is ironic. One person may think Taylor Swift is horrible, but there are a great number of people out there who like her stuff. Is there anything wrong with that?