Yes I have. They were actually a small group of Brony-in-denial who vowed and screamed around that MLP sucks, etc to follow the 'trend' of the Internet in a meme website and tried to make them look 'cooler'. That was soon after I became a Brony, and the atmosphere was still kinda insane. I found it kinda funny though. XD

Most anti-bronies are boring because they basically say the same thing over and over...