Not all brats are manipulative, when I'm in sub mode sometimes I will be bratty,,depending on who the Dom is. My brattiness is playful. I enjoy wit and laughter and will use it with Doms that also enjoy those. However I know when to reel it in as I don't use it to get my ass pinked.
On the flip side I can enjoy a bratty sub if he is not doing it as manipulation. I won't tolerate that from anyone sub or Dom, manipulation, in my opinion has no place in a relationship
Oh absolutely they aren't all manipulative. Not even most of them are. But they are there. Most often with this problem, there is a significant communication issue. Since the OP is new, and asked about subs being manipulative, I wanted to put that out there. This is certainly not meant to be slamming on brats, rather drawing attention to potential problems to look out for, so that pitfalls can be seen and avoided.