Entertainment Weekly: A Brony explains why fans say 'neigh' to [SPOILER]

Source

And this particular Brony is no less than Sethisto himself. You might know him. He's that guy over there on this little pony blog EqD. And he has an interesting opinion on this whole commotion going on.
Read the complete article on EW here.
It also mentions his real name, on a side note. Just in case you're interested.