I do not let kids or even adults get away with rude behavior.
I once put a 6 year old kid in the crack of a tree who was misbehaving at a get together - he was hitting other kids and would not stop. I did it right in front of his dad. I let him bawl until he agreed to not do it again. That dad has gotten a lot better and his son is pretty good now.
Its amazing what some parents will let their kids get away with. Some parents need an example - others will never get it.
EVERY kid I ever fostered had enormous issues with boundaries. They always came around - its so easy to set them.
