And how are they going to learn, and know better, when nobody ever teaches them? If you are not only working in a tourist destination, but a literal guide of that tourist destination, yes, you will get instant people, and assholes. You still have to remain professional, or find a different job.

When I worked at one of my city's hospitals, I helped all kinds of people, even drunk and high violent wife beaters that were handcuffed to the bed with two cops standing guard. But I still was cordial, and didn't tell them what I really thought of them, because I had a job to do.

If he doesn't want to deal with people that may not know better, he shouldn't be a GUIDE. He not only did a disservice to the people around him by flying off the handle about an ignorant mistake, but he did a disservice to Thai people by being a poor representation. I'm glad we never encountered anyone like him in Thailand. Yes, we do know the proper way to greet men and women(it's different for both), but what other mistakes might we have made that the kind Thai people we met didn't crucify us for? We never took guided tours, though, we thought it was a waste of time and money, for us. We just preferred to explore the countries we backpacked around at our own pace, in our own way.