When you offer criticism, be aware of whom you are criticizing and how they might receive it.
Case in point: A number of years ago, my son David was entering his senior year at Stanford University. He thought it might be fun to spend his last college summer freewheeling in San Francisco, working five or six shifts a week as a waiter. He figured he would earn enough money to really enjoy his leisure hours. He was pretty driven and interviewed at a swanky brand new restaurant called Stars, being opened by renowned chef Jeremiah Tower. It was scheduled to open three weeks later. Stars was a posh restaurant with a great location, catering to San Francisco's elite.