He wants to punish you and make an example out of it.

"Alright Brianna, for the last time i'm going to apply diciplinary mesures, because you have crossed the line now", he yells at her.

"Yeah, and what's the problem about my nudeness ?", you reply.

"That you are breaking the dress code for the school, and as so, i must punish you", he says.

"But what's your problem with me just having a good time ?", you question him somewhat annoyed.

"Because i'm tired of your little gambits and dares and your smug attitude", he replies annoyed.

"And what?, this isn't high school, this is college, i'm a legal adult and i'm free to do my own decitions", you comment angrily.

"Well, when i was in college, these sort of attitudes weren't allowed, and today's youths are nothing but noisy party-goers", he comments angry.

"yeah, and how i'm going to be punished then?" ,you say with snark.

"Then i'll have to make sure, you get expelled of the college for breaking public decency rules". he threatens.

"Not if i can", Brianna thought for herself.