Sure the Thai people are very friendly, and will smile and wave as you pass by, but unfortunately (in our experience) it’s very hard to get past the superficial customer-salesman relationship with the Thais. Tourists have been coming to Thailand for a long time and this has employed thousands of Thai people. Most of them are genuinely friendly, kind people, but as you spend more time here you will notice that there tends to be underlying reasons for almost every interaction. It’s nothing to be upset about, but don’t go to Thailand expecting to make lifetime friends like you can in places like the Philippines and Indonesia.