Very differing standards indeed. Obviously the uk go as far from practicality as possible. Especially treating pilots like suspects everyday of our working lives. I came back from Germany the other day, positioning the cabin but in uniform as I had been flying that day. I had a bottle of water from the last sector, and just left it as a 'test'.
The security staff were very polite and respectful, they asked about my day and we exchanged small talk for a minute or so.
In the uk, I usually say goodmorning, to have a response maybe once in a while. I have never come across such losers, so rude and pointless!
Oh well, the more inconvenience I can cause them the better, everyone needs a good flight once in a while!!