He knows you know how unacceptable your behavior is. Everyone keeps talking about it. As President of the school council, he's supposed to enforce the school rules against anyone who disobeys.

You were a prime example. Well, you refused to wear the school uniform and skip classes, and today, you were found out to be the one who kept spray painting in the school bathroom. He stood out in the hallway, looking at you as you were in detention. “What a delinquent..”