I'm so fucking triggered right now

Basically, I got in the car, and my sister had some tears in her eyes. I assumed that she had just sneezed a lot, since it's cold here.

When we almost reached home, my mum told me "She was crying before we picked you up. (Sister's friend name) told her that she was really bad at maths". That explained her tears. We got out of the car, my sister came to me and hugged me and began crying

Let's call my sister's friend J. So, they had this thing that was kind of like a test. J finished it, and thinks he got a lot of them right. My sister didn't finish hers. Apparently, J had called my sister stupid because she didn't finish. She didn't tell the teacher either because her and J are in different classes.

They are both seven. Hearing "I'm better than you, you're stupid" at that age, it hurts, I wouldn't be able to ignore it if that was me. At my age, I didn't have that problem because... Actually, I was kind of blackmailed kind of when I was that age, scrap that. But still, it hurts.

I've already gotten mad at J before. He acts like he's some sort of king or something. He scratched me once, for no reason. My sister began scratching me too after seeing him scratch me. He's a bad influence for her (I sound like a parent). He told my sister to steal my phone from my pocket once because I had games on my phone. He hit me with his lunchbox, and my sister did the same.

Something else that kind of concerned me was that he had the bravery to say that. He has such nice parents, but he's so rude and disrespectful.

Then, my mum tells my sister to stop crying, and that it's nota big deal. She said that if she doesn't stop crying, she wont be smart. BITCH LET HER CRY, SHE'S SEVEN, IT HURTS. She goes on saying that J reads books, that's why he's smart. STOP MAKING HER FEEL BAD ABOUT HERSELF

My sister is weak. If she gets bullied, she wont fight back, talk back. She wont tell anyone. I don't want her getting hurt. I don't want he to have problems in the future because of her quietness.

I'm realising that I'm also a pretty big hypocrite because I get mad at her and say mean things to her too. I'm a mean person