Uchiha Sasuke is a genius?
Grab him by the collar and give him a couple of slaps.
Gaara is a jinchuriki who kills without blinking?
Sand can block ninjutsu, but it can't stop the school bully from yanking your hair.
Orochimaru is one of the legendary Sannin?
If he dares bully students in the protagonist's class, corner him in the Forest of Death and demand protection money.
Madara Uchiha asks, "Do you want to dance, too?"
The protagonist smacks the back of his head:
"Don't leave after school. Meet me on the field."