The problem the law has with kids is that they must be perceived as vulnerable. Its difficult to argue with that.
We have plenty of laws regarding the various forms of assault. They apply to everyone - child and adult. I'm not sure we need so many special-case laws.
The really frightening aspect is the idea that an individual has an absolute right to not be upset, offended, annoyed, challenged ... and that if he FEELS this has happened, it is sufficient proof.