Do you think people who DON'T have children have the right to give parenting advice to people that DO?

I'm not a parent but I like to come here because I teach young elementary children. If I can manage 20 plus children that are not mine and give them an education somewhere in there, then I have some advice to give (particulary on behaviour management). At the same time, someone with no experience with children could teach a some parents a thing or two about parenting! You can take the advice or leave it. Good advice is good advice and bad advice is bad advice no matter where it comes from.