Is it weird that whatever my best friend likes, I hate?

I'm a 13 year old girl and when my best friend likes something, it seems to put me off it and I don't know why. For example, she LOVES Oasis, and I hate them. All you Oasis lovers out there don't answer this telling me I'm a so and so, I just don't like them. I used to be in LOVE with Rosie- Daisy Dares You, then she liked it so I just stopped liking it. Why do you think this happens? It's not like I have anything against her, she's my best friend, she just puts me off things. Thanks in advance:)