Really annoying friend?

I've always liked rap music. Pretty much since I was 9 and my best friend seriously hated it. She listened to death metal and all that kind of music. She never liked rap, ever. About a year or two ago I started listening to Mac Miller. He is sooo good and he's my favorite artist. And now she starts listening to rap and hip hop and all the music she hated before and Im getting so pissed because shes making it seem like a competion of who likes Mac Miller more. She doesnt actually say it out loud but she always says "You're right, Mac Miller is really good." Like I didnt already know that? And Ive always liked Lil Wayne and I remember her making fun of him and now she says "I like his songs except for his newer music." I dont get it at all, and I dont know what to do about it. It's so annoying and I cant stand it anymore. I know it sounds like Im freaking out about the smallest thing but the smallest things always annoy me no matter what it is and I cant help it.