[Lightspeed]

Totally. Being a parent doesn't automatically mean that you're instantly wise in the ways of parenting. Even after your kids are raised. Many people completely fuck it up.

And just because you haven't had kids, it doesn't mean you can't learn and teach good parenting skills.

If a parent quips back to genuinely good advice with "Do you have kids?", my initial thought would be the parent is acting irrationally ( as parents are prone ), however I think more likely it's the person offering advice failed to acknowledge the difficulties of raising children or otherwise neglected the parents feelings.