I think you're overreacting completely and so is your sister. When a man makes an inappropriate comment, the best thing to do is look him in the eye, tell him you know you're fabulous, and that his comment is completely and totally inappropriate and that he should IMMEDIATELY apologize to both you and your sister. NEVER allow a man to get the upper hand in your relationship with other women (which is
EXACTLY what he was doing, is doing, and will continue to do). Never let a man control you. You and your sister are the Queens, and he should be doing some serious humiliating grovelling. There's a naughty little boy lurking inside of all adult men. Treat him exactly the way you would a child; make him apologize in that very moment and humiliate him so he knows what's appropriate and what is not.