I'm completely open about it, sometimes I'll be singing a pony song to myself, and someone will ask what I'm singing. I act like it's no bug deal that I'm singing a song from My Little Pony, because it's not.
Only one person has ever been bugged by it(not even shoving it down her throat, I don't do that), and she happened to be my best friend from kindergarten to like, fifth grade. Then she started being mean to me and now makes fun of me for watching ponies. Everyone else thinks it's awesome, though.