Thank you for saying the BKK (SIN/HKG also) airport security inspection staff should give an friendly advice to their less than friendly BAA counterparts for Customer Realtionship!!
Many of my British friends get sensitive when I compare the kind of poor treatments I get when passing though UK airport security check points in comparsion to the effecent and freindly services one gets in the most of the major Asian airports.
I am sure deep down they are aware of it but don’t want to hear unfavourable comments from Asian traveller.
I now leave it to my British partner making disgruntled noises at these BAA security workers instead while I stay at the background to watch the “scene”. Smirking like a Chinese Cheshire Cat of course!