You sound like one of the luckiest people in the world. If that were me and I wrote down that I was a brony, my face would be redder than Soviet Russia during the guessing game, which may give me away (or I may run out of the room as you said). I'd be incredibly confused when I got a positive response for being a brony, and I would think that they were all lying and mocking me in a sarcastic way (especially the jocks). Of course, although my school is known for being a good school, the students still wouldn't be that tolerant, and closet bronies certainly don't abound. Regardless, it would teach me a valuable lesson not to divulge things like that again, unless I knew it would be in safe hands.
Analysis aside, I congratulate you on your success.