Don’t be disrespectful to the King
Thais hold the King of Thailand in the highest regard. There is also a law in Thailand, the lese-majesty law, which means you can be arrested for saying or doing anything that is disrespectful to the King or other member of the royal family.
It’s best therefore not to mention the King and certainly never to do anything which is disrespectful.
Don’t touch someone head
Unless you are in a very close relationship with someone or are with a child, you should not be touching or putting things over people’s heads. The head is considered the cleanest and most holy part of the body, so touching someone’s head is seen as disrespectful and will make others uncomfortable.
Don’t point your feet at anyone
Feet are considered as being unclean, or the lowest part of the body, so pointing your foot at someone is impolite. Don’t close doors with your feet either, and never put your feet up on a desk or table.
To be safe, make sure your feet are flat on the ground at all times.
Take off your shoes
Do you know why sandals are so popular here? Well, it is hot, and you are always taking them off. Entering homes, temples, shops or even some restaurants and bathrooms, you will be asked to take off your shoes and walk around barefoot or with slippers. Be aware before entering a place if you need to remove your shoes or it is okay to leave them on, the pile outside the door is your biggest clue.
Don’t point at anyone with your index finger
Thais don’t use their index finger to point at anyone, it is considered rude. If you do need to point at something, hold out your hand with your palm facing upwards and point using your whole hand.
Don’t hug monks
Monks are highly respected in Thailand and therefore it is forbidden to stand over or be positioned higher than a monk. Monks are not even allowed to touch women. If a monk comes in contact with a woman, he often will not even hand her something.
So, if you are a female and see a seat open next to a monk, do not sit down and force him to stand. Men, however, are allowed to come in contact with monks, but most will still keep a respectful distance.
Don't wear shorts or a short skirt to the temple
Buddhism is the dominant religion in Thailand, and many of the most magnificent temples are located in the Old City district of Bangkok. Spending a day visiting the temples is high on many people’s itinerary, but make sure you dress conservatively, with a T-shirt covering your shoulders and a pair of shorts or a skirt down to below the knees.