It is very important that all gun owners make their feelings and buying decisions known. Take a minute first and think about what you want to accomplish. If so, you want to yell and scream and threaten and get it all off your chest.
Profanity works real good here.
But, if your goal is to accomplish something positive for the future of the right to keep and bear arms, think carefully about how you communicate. Don't bother trying to educate them. This is not the time. Simply explain in polite terms the nature of your complaint, and let them know what if any action you intend to take. Keep it brief, polite and to the point.