"Mineta! You're a boy in a man's world!..."
Basically Mineta and Shinso become rivals because Mineta is the lowest ranked 1-A student and if Shinso moves up he replaces him but Mineta somehow and someway always stays in the number 20 spot:
Shinso pointed a thumb at himself, Mineta watched. "And I'm a man who loves to play with boy..." His voice trailed off as he realized what he was about to say.
All of class A burst into laughter. Shinso looked around angrily as they did, "Hang on! Hang on! Shut up! Shut up! What I meant to say...was...listen!"
He pointed at Mineta again, sweat beading on his forehead. "What I meant to say...is that you're a boy and I'm a man...and in this match I'm gonna manhandle you-...SHUT UP!" He screamed as Monoma bowed his head and shook it while Shoda let out a massive belly laugh. Yui and Reiko seemed embarrassed to be a part of this.
"Alright! Alright! Listen! Mineta, you're a boy and I'm a man! And when we get into the match I'm gonna get on top of you and...AH SHIT!"