Yes all that! Teachers definitely don't have much authority and parents always believe the kid. Ice had some horrible situations where a parent would be shouting at me after the kid outright lied and I said as much.
Luckily I worked in non government schools that were a bit easier behavior wise and I could actually teach with an academic focus. I'm not sure if survive in a state school these days. Most of the time the kids are gorgeous. I love teaching students, it's all the other stuff I hate. But I'm definitely done now - I won't ever go back. I'd rather pack shelves in a supermarket.