Thailand main religion is Buddhism and it is practiced over 93.6% of their population. Many of their rules of etiquette are by-products of the Buddhist religion.
Thais respect a hierarchical relationships. That means in a social relationship one person is more superior than the other.
Thais family is a form of hierarchical with the parents being the most superior. Children are taught to respect their parent and elders.
In Thailand, a form of greeting called wai is a common way of saying hello. When someone gives you a wai it is common courtesy to wai back.
Respect is very important in Thailand culture. For example it is considered very rude to wear shoes in the house or put your feet up on table or seat.
Through out Thailand there are many attraction site for tourist, places like temples and palaces are highly respected by the locals for their religious values. There are certain etiquette you must follow when visiting these site like formal clothe that means no flip-flop or skirt or shorts.
While there are much more unique personalities to Thailand and its people making it one the most fascinating place to visit on Earth. The feeling you get just by walking down the street that makes you smile, and the happy-go-lucky nature of Thais people which earn Thailand it title 'The land of smile".