Of course making personal insults towards the opinion of a child is terrible, unnecessary and no one should be doing it or condoning it.
To be honest, here, Brian, to me, you're coming close to engaging in ad hominem attacks that sounds like you're suggesting anyone without kids isn't allowed to be critical of this. That isn't cool either:
Just like the opinions of kids on this park are totally valid, no one's negative opinion here should be dismissed on some basis of "Oh, well, you're a childless adult and you weren't going to come anyway."
And like others here have pointed out, a lot of defense we're seeing about this park is not on its merits, it's trying to police who deserves to offer their opinion. That's interesting.