Kids perceive a lot more than we might think. I know my parents made lots of well-intentioned, passing comments that were nothing to them but stay with me decades later.

While I agree with you about the funniness, I worry that a kid might justifiably feel condescended to by that response and thus lose trust in the responder, an authority figure - especially if that figure is a parent, which is to say, a person they have to trust as an implicit safe figure.

I want my toddler to feel free to say anything to me, be it gibberish or a deep and well articulated philosophical point, and know that they won't be mocked for it. That's how they know it's okay to explore and, if they wish to, share their thoughts. Even if their thoughts don't make sense to me.

Teasing a kid isn't inherently wrong, but even before they're articulate, your response to their words - or gibberish - matters.