I personally dislike the show because it's not a show for me, a grown ass man. If people my age like it, good for them, I honestly don't give a stuff. But when they feel it necessary to go around and "present" their fandom to me, I will loving go ballistic.
A brony is a man of an older age that likes 'that show' to the point where they feel it necessary to display their fandom to everybody. If you asked me how I feel about them, I could say without hesitation that I would not mind if they just died. For one, none of them can display a good reason why they like the show (although I think we all already know why). The artwork, the story, the characters have absolutely nothing special about them. It's completely blatant that it was a show intended for young kids, although it seems the creators have 'accepted' it's older audiences and have decided to cater to them as well. It's honestly nothing to revel over like bronies do.
Now it's gotten to the point where their fandom, their fan art, just the entire 'sub species' has become a tired and old joke.
It's time to grow the forget up.
(And for the record, a brony is a furry. Don't try and deny it)