When I was a kid, I hated classical music. It all sounded the same to me, because I wasn't familiar with it.
My dad had a cartoon taped to the fridge that showed a teenager in a record store saying, "I can't remember the name of the song, but the words are, Rock, Rock, Rock, Rock, Rock, Rock, Rock, Rock." He thought all rock music sounded the same, because he hadn't listened critically to it.
There's an old joke:
Q -How do you tell all the fiddle tunes apart.
A -By their names.
Someone who listens carefully to any genre of music can appreciate what makes each tune unique. I must admit that all rap music sounds alike to me, but I'll admit that I haven't given it any time.