Children are human beings and we were all children once, yet people think it is acceptable to dislike them, just for being children.
Often people will say that they don't like bratty, ill behaved children, but then adults behave far worse and yet it is generally unacceptable to say "I hate men/women".
People used widely say I hate Jews/gays/black people, but now people generally (not all, sadly) know that it's wrong to think that way, so why don't people realise that about children?
Before anyone thinks I'm being over sensitive, there is far too much ill treatment of children (there's been some heinous threads on here, where I've wanted to weep for the children involved) and I think we really need to change our attitudes.