Do you think for a moment about what that person had to put up with for the hours before you arrived that day, or will continue to deal with after you leave?

Is it not enough that you've managed to retire as a young man and lounge on the beaches of Thailand, do you also need to be treated with smiles and deference by people who still have to go to work every day? They have a job to do, and your abuse isn't going to help anything. At best, it'll just make the experience that much worse for the person in line behind you.

Empathy is not something that can be forced on a person, and a comment on a web page isn't going to make you change your attitude or think about anyone else's life, but then again, being a dick to customs agents isn't going to help, either, so I guess we're both wasting our breath.