How do you deal with unreasonable adults?

So I just served my dention (look at my last post for details) but I am pissed because it isn't fair I got detention and the only person not okay with it is my principal. My teachers were okay with it and my classmates! And the girls wearing tube tops with their boobs out don't get detention? It was literally just me in his office after school being lectured so stupid! I might just keep dressing like that then
How do you deal with unreasonable adults?
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