And What Have You Done?
When deciding whether or not to listen to advice (or criticism) being given to you, ask the person dispensing it, "What have you done?"
You don't need to be condescending about it, but make sure those giving you pointers have the experience to back up their recommendations. Theory, in leadership, parenting, relationships, and entrepreneurship only gets you so far.
Skip the show and tell. Pay attention to those who do and tell.