I can understand their reluctance. However, I would hope that the security officers would do their jobs dispassionately–in other words, by maintaining a poker face and refraining from needless comments while watching their monitors, and not responding to the image of a person with, “Holy cow! C’mere you guys, you gotta see this!”
It’s been a while since I’ve flown, but based on past performance, I think security officers have a long way to go before they approach the level of tact necessary to assure your trans friends that they can fly without fear of embarrassment or worse. And that’s rather sad.
Frankly, to what extent members of the TSA can see various parts of my body is far less worrying to me than things like the paper from John Hopkins questioning whether it is even safe to stand near an operating scanner, along with allegations they’re already finding cancer clusters in TSA workers, as well as the allegations the DHS lied about the NIST having tested the scanners when the NIST does not, and did not, do any testing.