You knew about Narancia's struggles with math, so you were always mocking him about it. Teasing him by telling him that he was an idiot and that he would never learn anything. As he tried to study, you made fun of him, again, by babying him as if he was a toddler learning how to count. He snapped.

“Hey, listen up! I'm tired of this, okay?! I'm not that stupid! I already have enough dealing with Fugo! I'm not a baby, and I don't need help!”