There really is no ruling on answering kids questions.
If it is sexual in nature, I will usually pass up on it, OR, I will say something like ask your Mother to answer that one for you.
UNLESS, it is an honest sincere question and you can really tell those.
Then there are those that are just TROLLING and looking for the response.
I usually ignore those too.
I have flagged a couple because I honestly thought that it was a man with a teenage girls screen-name and page.
what is offensive about it? they are personalities with ideas and thoughts. I haven't seen any reason to disrespect them. Is this a control or elitist issue?