Niki's father is best friends with ur father since the childhood, so at this point u and Niki often meet, he's ur rival and u both hate each other, the whole school calls u both "the rival duo", u hate Niki so much and he hates u too

Niki: standing next to his locker with his friends as he sees u passing by wearing ur headphones and using ur phone yo yo see who's here, my lovely enemy, hey! U definitely lost from me again didn't u?