Originally Posted by
meiji
I wondered that too. There's also the chance that they don't go much for "sexual harassment" of the TSA staff

On what legal basis would a court consider a single wink to be unlawful "sexual harassment"?
I'd be amused to see court proceedings that determine that a passenger winking once at a same-sex-as-passenger TSA screener is unlawful "sexual harassment", especially when the winking is done by a heterosexual.