I've spent time in many Asian countries.
I've worked in India, South Korea, Philippines, Vietnam, Malaysia, Brunei, Indonesia, Singapore and Thailand.
Travelled to Cambodia and Laos.
Worked with many of the locals, they all seemed nice but Thailand I reckon are the happiest, friendlier and most welcoming people.
Like people in most Asian countries, they assume that we are all rich so expect the occasional Thai to want something from you.