Denise,
Yea, kids haven't got their filters in place yet. Pops into the mind and pops out the mouth in a blink of an eye. A couple years ago, I was in a pool in a one-piece, skirted swim suit. A young boy splashed his way to me and loudly let the world know "You're a boy!"
In your case the Mom responded well. In my case the Dad, he just smirked. "Like father, like son."
Disconcerting.
Stevi