It's a job program. And mostly theater to dehumanize you. Most VIPs get to skip it all together.
LHR security is just as bad IME
Get the fuck outta here.
Indeed, Heathrow security is the rudest I have experienced. They get aggressive if you so much as ask a question. Furthermore, I have on numerous occasions had them argue with me to go against the medical advice from both doctors and medical advice manufacturers. Last time going as far as claiming that a scanner does not emit electromagnetic radiation.