See, that's one of the problems with forums and groups nowadays--it takes zero skill or effort to set them up. Before you'd have to secure web space, copy files, set permissions, run the install and hope it goes well, keep it updated, and all that crap. Now all you do is press "new group" and...that's it.
Most people absolutely are not suited to being moderators of discussion groups. They either let their biases get in the way, they power trip like a motherfucker, or they just let anarchy rule. Some of them are way too heavy handed, some of them don't have the balls to ban people that they like if they fuck up. I don't really do much on Facebook, but from what I've seen I most certainly have seen plenty of people that fit all of those categories. Another thing is that a lot of these people can't take criticism. Regardless of how you phrase it, they'll fly off the handle and treat it as an attack on their character.
As far as your behavior is concerned, I don't recall ever having a problem with you on a0.com. So there's that, I suppose.
Also, enjoy your fancy new member group!