I'm pretty open about it. I wasn't really before until I told my best friend while we were working on my truck. He kinda trolled me about it for a bit, but we usually troll each other a lot about random stuff anyway, so I could tell he was cool with it. He still pokes random clopping and other stereotypical jokes at me every once and a while for the lulz, but he knows it's not true
Anyway, ever since I told him, I don't really care if anyone finds out that I'm a brony.