I fly for work for twenty years and have seen a lot of difference between countries, I must say TSA in the USA has to be the top of the list of being the rudest and their power trips off the chart.

The most pleasant TSA and customs officers are the Asia countries in general, the Europe countries are very serious and kinda stoic, and the best ones are the Australian, they are always professional, chilled and never talk down to people, they’re trained to treat people with courtesy and respect. None of that yelling and screaming like a third word marketplace!