I'm always amazed at how little reading comprehension people have, or how they end up responding to things in their own head.
1 - your example of your little brother acting like an asshole doesn't mean it's "shit that kids do". This is "boys will be boys" shit, and that's not acceptable. This is like saying your little brother throws rocks at moving cars or at animals and it's just "shit kids do". Misbehaving kids do it, and need to be taught better, but it is not normal kid behavior.
2 - no one is saying they're talking to the kid like that
3 - part of teaching kids to be better people is showing them there are natural consequences for their actions, which guess what? That's a form of punishment, and it isn't violence.
If you call your five year old garbage for acting out, you're a shitty parent.
I ask my kid what's wrong and work with them to find a solution, and implement natural/logical (and because crayons are needed, non violent) consequences for their misbehavior. I may use choice descriptors for their behavior when they are not in the house, but I would never speak to my kid that way.
It baffles me how many people in this thread don't have a concept of natural/logical consequences as punishment, and it really fucking shows in the responses. But I guess when you're raised with violence and can't be bothered to look into alternatives, it's easy to assume and drag people on the Internet