The flight attendant was demonstrating the correct use of a life vest and I can imagine where she was in her presentation maybe or maybe not but whatever it is a presentation that could make a difference in life saving. The guy was a jerk and they had every right to throw him off as it sets the tone for any other idiot to act stupid. You don't do it when going through the security line so why should you do it in front of a woman that is trying maybe preserve your safety. You're going to be couped up and served by these ladies so for a few hours you can be adult or is that to much to ask anymore?