I don't have a problem with the pony either, but there is another community that uses the pony, and the Django folks would rather not associate with.
For mainstream fans it's really quite simple. Some extremely talented adults made a children's show. People of all ages enjoy and appreciate their work.
ANYTHING. EVER.
Besides rule 34 ponies isn't what is leveled against the fandom. It's the 'fact' that they're all pedophiles. Pedophiles that apparently want to broadcast this fact.