Dude! I've usually, NEVER had a problem with letting people know that I play Pokemon. Heck, I go to school with my grey hoodie with all my League Badge pins on the front. People comment about it, and I tell them about Pokemon Leagues and how you can get together with friends to play Pokemon, and earn some free, glittery cards to boot! Except erm, not THIS year, apprantly Bs...
To mention the benefit of the doubt though, I must confess that I felt a little embarrassed about it when I was a child. I wanted to be a manly person and become athletic, so I tried to lay low about my affection towards videogames, Pokemon, etc etc. But I'm SO past that now, haha!