> If I interpreted "man-child" correctly it is meant as an insult towards a person behaving immaturely, like a "child". Not quite sure how this relates to the "toys" in the background of his posted image.

I assume something is being lost in translation here.

> Though personally insulting Elon Musk is not really productivie criticism anyway. Neither is insulting the author of the post.

I'm responding to a criticism made in a trending article. If it's ok to post it's ok to challenge, and it's certainly productive criticism because it helps paint a more complete picture of the author, whose credibility we're being asked to accept.