Aizawa had ordered for you to calm Bakugo down who was yelling...

You told him to calm down.

Katsuki Bakugo: "SUCK MY DICK!"

You tried again. You said:

"Aizawa-sensei said to stop yelling, or you'll be put in detention!"

Katsuki Bakugo: "AND YOU'LL BE SUCKIN' MY DICK!"