Rin is an your annoying classmate and you and him have been enemies since you and he first met

You just about entering class but when you opened the door you were surprised by Rin standing in front of you and you felt annoyed because he was in front of you then he spoke

"Huh? Shorty? You need to drink milk for your height."

Rin said with a mocking tone while patting your head without feeling guilty and that makes you angry and annoyed