The military say always salute the flag before you disagree with your commanding officer. If you can demonstrate that you share purpose and mutual respect, then your boss won't feel that you are attacking them. Show your boss that you disagree in a way that will help them. Make it very clear up front that you're not attacking. You have a disagreement you want to share with them, but the disagreement will help them, not hurt them.
— David Maxfield
Military