Well, you don't have to be butt-hurt about it. (And to be honest, I kind of expected this to be a reason._
And, as crazy as it sounds, people who are a part of a fandom will draw what they're a fan of on their channel. Surprising, I know. I'm just saying, you're kind of being a jerk by saying "Ew... no ponies because bronies annoy me and I can't stand them." I'm just saying, you're kind of being prejudice, and could have a lot more things to ban than just ponies (I do realized you have "toilet stuff" banned too, I'm just saying out of all the fandom based things).
I'm not saying I was going to post my pony pictures here, because i don't know how half the groups feel about photomanipulation, anyway, and the rules kind of say so. I know these are your rules, but the rules you have will determine the amount of people who'd feel like the group would actually be good or not. And a lot of people, including non-bronies, will be scared away from admins who say stuff like "I can't stand all these ponies everywhere, I'm going to ban them because I'm butthurt over their existance, and they're annoying, so go away before I get more butthurt."
I mean, if it was because you ban animals or anthros, I get it. If it was because you just don't want ponies with breasts and vaginas, I'll get it. Any reason other than "I don't like them because they're annoying", trust me, I could say the exact same thing to Sonic fans who 90% of them hate on bronies for no considerable reason whatsoever, but I don't, so I won't.
I'm not saying you have to have ponies here, just be a little more less butthurt when you get to your reasons. You said if I don't like it I can leave the group? I never joined it, anyway. So, here I'm getting lost. But notice I'm getting lost to another group, that still doesn't allow ponies, but has a non-bias to it. (Yes, those exist, thank god.)