I know what you're talking about, Zip. I've never had a lot of tolerance for brats. Kids, through inexperience and lack of understanding are going to screw up. They all do, we all did. I can handle that, but deliberate, malicious, button pushing I can't tolerate.
I've been told, they have to do that to learn how far they can go, testing limits and learning consequences. Hey, I'll help them learn the consequences. What happens when they pull that shit in the real world.
I'm told it's different when they are your own spawn. I chose not to take that risk because the SPCA won't take 'em, ya know.
They claim it's all on the parents, the nurturing and affection. That doesn't explain why a couple will have several kids and one turns out to be a clinker, though. I've seen it several times, where one of the brood is a monster, among normal siblings. There has to be more to it than the nurturing.