adults being into kids shows is retarded. there are lots of people that are into pokemon. im pretty sure a lot of it is for attention and to be 'alternative'. and a shitload of bodybuilders are into dragon ball z (wtf). i couldnt even watch that shit when i was a kid and now there are grown men acting like its the best shit ever.
I think it's pretty stupid to be like you are xx years old you shouldn't be into/like ______ anymore in most cases. The My Little Pony with Bronies thing is more that it's a show that's specifically aimed at little girls that a group of grown men just don't only seem enjoy (whatever there) but actually self identify themselves as a group because of how into it they are. That's a little weird to me but like I said to each their own I guess.