I care, but my steam friends don't give a stuff, even if I put a brony group as main.
In my opinion, worrying about how people would react about something silly like that is a flaw. It's just, well, silly worrying about what others think of you watching a show like that. Hell, I have the comic con poster framed in my room and I don't care.
I'd understand if you were worried about admitting you were gay or something like that since people actively hate about that, but something so silly like My Little Pony, a harmless cartoon?