An important aspect of the Thai character is that they expect a certain level of equanimity, calm, and light-heartedness in any personal dealings.
If you are prone to temper, aggravation, and frustration, Thailand can be a challenge.
The Thais hold two things sacred: their religion and their royal family.
In temples and royal palaces, strict dress code is enforced.
Thai customs can be a bit confusing; foreigners are not expected to know and follow local etiquette to the letter, but good manners and appropriate dress will earn you instant respect.