Well, you could just try throwing in some references in a regular discussion. If they ask what it is, you can say that you watch it in a joke-ish manner, and see how they react to that.
When i actually said something about it, it was a kind of fast-paced conversation where we talked about kid shows, and i said ''Hey, remember when i said i was going to show you a real kid's show? I meant MLP''.
Well, i said that to my dad's girlfriends daughter (who's 18), but my dad was also sitting there. She then said something like ''Oh yeah, i know there's a lot of guys who watch that show'', and i said ''Yep, seen every episode''. Then she just went ''Oookay...'', but not in a serious ''Shit, we have a gay over here'' manner, but a more like a joke. They didn't speak about it any more after, though.
Wait, on the internet or in a retail store?