Okay, so this morning she was listening to some music sung by a Japanese singer.
The singer is quite famous in Japan... but I personally think he's not that good (pretty bad actually lol). Again, this is MY opinion.

I was just washing the dishes minding my own business and when he sung a high note (which he did awfully in my opinion), I just kind of sung along with him in a jokingly way. Which I always do for fun and my mother usually laughs along with me. Then I said "I don't really like his voice. It's not THAT good."

And then oh my goodness, she starts to get SUPER angry. She decides to go all out on me and starts to get all offensive.

This is her... literally: "You can't call him a bad singer. He's famous for a reason. When you call him a bad singer you're basically calling the whole country stupid. You're saying that everyone in Japan doesn't have good taste in music and that you're better than all of them. And by that you're also calling me stupid for liking him as a singer. You think that the singers you like are the best (I like k-pop lol) but they're actually not good at all. You just blindly like them because they're good looking. I bet you're going to blindly choose a husband as well."

OKAY. WOAH THERE. Was it really necessary to go to that extreme? Was it that wrong for me to express my opinion on something? She's jumping to all these conclusions, which I don't even know where they came from. Then she also disses me at the end... which really pissed me off.

She hasn't been talking to me for 5 hours now... and I don't feel like I need to talk to her either. She's the adult here... but I feel like she's acting so immature.

Please tell me where I went wrong.