I think he failed to distinguish between childish and childlike. The latter is a good thing: lots of energy, a sense of wonder about the world and a playful personality. The former usually denotes immaturity, pettiness and irresponsibility.
I'd like a partner to have some childlike traits, but preferrably not be childish.
Childlike: "Lets go ride the bumpercars at the fairground. I love those!"
Childish: "What do you mean you can't? We never do what I want!" *gets mad*
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I'm bored out of my skull, let's play a different game. Let's pay a visit down below and cast the world in flame.