A Canadian magazine called Macleans recently released this article about the fandom. It looks like they started gathering for information a few months ago, because some of it is pretty outdated.
They talk about various things in the culture. I can't really tell how negative it actually is. A few things in the article might spite some of you a bit, otherwise it's relatively tame.
I was going to save this for the nightly, but it seems there is enough interest to drop it here.
You can find their website, with the article, below!
Men Who Love "My Little Pony"
Also a bonus Side Article
Thanks to Dan for the scan.