Yes, much of this lifestyle, especially online, is theatrical and contrived... that's unfortunately, how it is...
Now, like I said before, though I do have the tendancies to act bratty sometimes, it's not a staple of My personality. And while I am not a "brat," if it's a kink for [the figurative] you, then so be it. Clearly, we are all here to do our individual thing and while it's not My interest, it doesn't mean it shouldn't be respected by Me or anyone else... however, I don't see much cross over between a person who defines themselves as a Domme in this lifestyle and a person who defines themselves as a brat... they are just 2 seperate things, to Me.
But, not trying to be the sole authority on the subject, I can admit that I do think there IS plenty of room in the fetish scene for all types of people, but I just don't think that being bratty equates being dominant-- at least from what I have seen the "brat persona" come to signify. And that is OK because it is it's own thing, just as everything else.