I would even go so far as to say the majority of the population are friendly and decent. However, I would add that the majority of people in the tourism industry (or those who deal with foreigners) are unfriendly and dishonest. Countless times my bill after eating included items I had not consumed and in most towns I walked three km or more from the bus station into town with my pack instead of paying an inflated price to a tuk-tuk driver.