How to opt out of the TSA's naked body scanners at the airport

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I encountered my first airport naked body scanner while flying out of California today, and of course I decided to "opt out" of the scan. You do this by telling the blue-shirted TSA agents that you simply wish to opt out of the body scanner. Here's what happened after that:

A TSA agent told me to step to the side and stay put. He then proceeded to shout out loudly enough for all the other travelers and TSA agents to hear, "OPT OUT! OPT OUT!" This is no doubt designed to attract attention (or perhaps humiliation) to those who choose to opt out of the naked body scanner. I saw no purpose for this verbal alert because the same TSA agent who was yelling this ultimately was the one who patted me down anyway.

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