I don't have a problem with the message, but with the delivery of the message. Why not have a CC call or open discussion forum? Not a set-up where a damned if you do, damned if you don't situation that stretches out over hours or days. If she wanted to demonstrate what is acceptable and what is not, then why not do it in a classroom type environment. Display pic-"this is acceptable," show different pic-"this is not" and then discuss why. Leave the guess work/gray area out of it. No tricks, no gimmicks. Your airmen are adults. Treat them like adults.