When I worked in mental health, occasionally I had patients who were sexual predators. Offenders often tell victims not to look at them during an attack in order to depersonalize them and reduce guilt. It also reduces the victim's ability to accurately describe them afterwards.

Non-sociopaths whose jobs require them to invade others' personal space may experience significant discomfort from having to do so: avoiding eye contact allows them to more easily objectify the person, and protects them from the implied hostility of a direct stare.

LEOs and correctional personnel become desensitized to this because most people they search are suspected/convicted of criminal activity, so their personal safety legitimately requires touching the person. Health workers, on the other hand, desensitize because they are expected to help, by doing so, the person whose space is being invaded.

TSOs work with the general public so don't fit either category; thus, their discomfort levels may remain higher despite experience. They may compensate either by "repersonalizing" the searchee, trying to make the process appear consensual and mutual, or alternatively by exaggerating the power differential and enforcing their "authoritay" by brusquely giving orders, avoiding the normal etiquette of "please" and "thank you," etc.

And then, if your screener was trained by Joseph Cioffi, it might be just due to old habit.