I mostly travel through Denver and Seattle. I opt out every time I fly (several times a month) and have rarely had a problem. The TSO has always asked me to identify my belongings and then carried them to where the pat-down will take place. I absolutely agree that you must keep your belongings in sight at all times. Every pat-down I've had has been professional, and the TSOs have always been respectful. I don't think you have anything to worry about. DON'T be a wiseguy by offering to tip the screener when he's done!

George