Having a picture of [insert favorite character] killing [least favorite character] has as much impact as the whole "My dad can beat your dad"/"Nuh uh, my dad can bench the school" arguements you used to experience on the schoolyard.
I don't really like bronies too much. Instead of making a bloody cinematic picture of dead pony things like a, well, weirdo, just have at the Wooden Brony on the toybox. You'll get less odd looks than a pony massacre picture.