I always opt out of the scanner (even have a special shirt [1]), and without fail they always stand me by the intake (radio-leaky-end) of the baggage x-ray machine for 5+ minutes.
https://preview.redd.it/travel-safe-for-thanksgiving-v0-i3ja...
But as an organization, they clearly have a culture that allows or even encourages people to openly abuse and harass travelers, and punish people for exercising their rights. When I was being sexually harassed by a TSA agent, the other agents standing nearby allowed it to happen and said nothing.
I had a phase where I would always wear this "cease your investigators" shirt, never had any comments but yea stood by the machine for 5 minutes or so, never considered the machine would be radiating outward as well as inward, but yeah, mostly did it as a small protest, thought it worth demonstrating you don't have to comply.
https://neongrizzly.com/products/cease-your-investigations-i...