No, I don't hate children, that's a pretty disgusting thing to say. On the other hand, I don't really like a fair few of them, specifically ages 12 and 13. Obviously there are nice ones, but I remember being a colossal tosser when I was that age (it was only 4 years ago, after all) and the ones I see around me at school are pretty much the same.
But do I hate them? No, of course not. People say love is a strong word used too casually but they throw around hate like it's nothing. To hate is a burning, intense desire for the world to be rid of someone or something's existence. I've never encountered a stranger I've felt that about.