There is this girl in school - Charlie - that have balls bigger than many men (figuratively of course). Basically she's just a pure tomboy, pretty tall, strong and blunt. And quite threatening, to be honest. And per new school's policy about that gender stuff you are forced to comply with the pronouns they choose.

But you haven't frankly spoke to her yet, so you assumed that with their behaviour it may be safer to call them a him. It's a gamble, but at least you can excuse yourself with the policy. Probably.

And the day has come when you accidentally met her and responded like she was a boy. And it seems that she didn't liked it...