Posting pics of other people's children without the consent of the parents or the children is not civilized behavior. You don't like what I have to say about his kids, then stop exposing them to a place where people express their honest opinions.
I understand and agree with your point over the moral wrongness of posting pictures of a celebrity's child who hasn't voluntarily chosen a life on the spotlight. It is probably a mistake, albeit I believe often not an ill-intentioned one, at least on on my part and tbh it's not sth I'm proud of, at all. However, it doesn't relate to or change the sour taste left by your comment. As you may already know, some things are better left unsaid, even if they do come from a place of honesty and I'm afraid this is the case.I hope you can see that and recognize that you made a mistake too.