I'm giving it up.
One of my weekend teen classes has a new student - Boss. Boss is about 13, wears tight pink t-shirts and is very fond of sitting with the girls. To say he minces doesn't really do justification to the way he walks, and when he speaks, he doesn't so much speak as squeal.
Anyway, this class also has a gang of boys who don't approve of Boss's lifestyle choice. For the first few lessons I had trouble shutting them up when they started making smartarse comments about gays and katoeys. I finally got the upper hand by threatening the ringleader - Kong - with a call to his parents about bad behaviour. He nearly burst into tears and complied immediately.
Last weekend, we settled into our classroom routine and I was keeping a lid on things quite well I thought. During an open pairwork activity (where one student asks a question then nominates another student to answer), I set a rule that girls could only nominate boys to answer and boys could only nominate girls. It came to Kong's turn to ask a question and nominate a girl. You can guess.
Kong: How much do you spend a week on snacks? Boss.
Everyone falls about laughing.
Me, sternly: Kong! I asked you to nominate a girl!
Boss: It's ok teacher. I am a girl!
Everyone falls about laughing.