Recently, a friend of mine had a "disliked videos" playlist removed from his channel for allegedly endangering children, even though it contains nothing that would endanger children.
The channel has no videos and was purely used for commenting and playlists.
If all playlists must be child-friendly, they would also need to remove all sexual education playlists and many music video playlists, including every playlist with "Wrecking Ball" in it. Funnily enough, Wrecking Ball appeared in Rewind 2013.
It seems any kind of public disliking is unwelcome on YouTube. They removed the public dislike count and they made clear they want no dislike playlists either.