What is a very sacred thing for the Thai is their head. You should never touch a Thai person on the head. For them, the head is the highest part of the body, where the spirit resides. Touching someone on the head is absolutely considered a humiliation and an insult. Even with children, if you brush them through the hair or pat them on the head, even they feel directly harassed as if you had spat on them. Not even among friends.

The feet are the opposite of the head, the lowest part of the body and also the dirtiest and filthiest part of the body. You also dont point your foot anywhere. For example, on the beach lounger, you dont point your foot at someone or something in a conversation. For example, pointing with your foot at the water bottle and saying, please bring me the bottle of water that is there. That would be extremely humiliating for the Thai person.
When sitting cross-legged or side-sitting, do not point the sole of your foot in the direction of another person. You will notice that if a Thai person is sitting next to you and you have one foot up/cross-legged, they will get up and walk away. When the sole of the foot is shown, a Thai person gets the "horror". It is customary to enter a house or temple without shoes.

Finger
Pointing at something with your finger is also rude. You point at something by stretching out all your fingers or with your whole hand. This applies not only to people but also to objects.

So when you go to a temple, you see a lot of shoes, thats common. But also when you go to a temple, whether you are a woman or a man, your shoulders should be covered (no muscle shirt, strap dress). Trousers/dress must also cover the knees. Shorter is disrespectful. A Thai person will never be seen entering a temple with their shoulders uncovered.

A naked upper body in ALL of Thailand is considered completely rude. This is especially common in tourist areas when men leave the beach in swimming trunks and their torsos exposed. A Thai man even among friends will ask you beforehand if he can take off his shirt, even if he should be higher up. It is even forbidden by law to drive a car with a naked upper body. It is the same as not wearing a seat belt.

Throwing things to someone is disrespectful, comparable to throwing something to a dog. Therefore, one gives things directly into the hand and does not throw the key, for example.


Many Thais believe in ghosts, hence the small sacrificial temples with drinks and rice bowls that you can see everywhere in Thailand. If you whistle a song at night, many Thais get a shock.
"What an asshole, hes calling evil spirits to me here."
Because thats how you "summon the evil spirits". Buddhism and the previous belief in spirits are intermingled, so belief in spirits is just as much a part of Thai religion.


Monks enjoy the highest respect. Actually, one should duck a little when passing by. But tourists are not expected to do that. The point is not to place oneself higher than the monk. That is also meant literally. You should not stand on a bench while a monk is sitting next to you.
You dont touch a monk. Especially not women. A monk will never touch a woman. Even when making a donation to the monk, he will hand a small basket because he is not allowed to take anything directly from the womans hand. Even sitting next to a monk on the train as a woman is inappropriate. The monk would then probably get up in horror and look for another seat.


Taking photos and souvenirs of Buddha, the statue, the Buddhas face are actually not allowed by law. No one will say anything about photos on mobile phones, the law is a very old one, even before the first smartphones. But taking a Buddha statue home at the airport for decoration purposes is forbidden by law.
Buddha may not be misappropriated for decorative purposes, because religion is taken very seriously in Thailand and is not used for entertainment or simple decoration.


E-cigarettes are generally prohibited. Smoking and even importation are prohibited


Showing this no respect is already an insult, a royal insult. Defamation is punishable by law with up to 15 years in prison.
Attention. The head of the king is depicted on every coin and banknote. If you drop this coin and step on it with your foot, you have theoretically earned yourself 15 years in prison. The tourist will probably be forgiven, but you can definitely expect trouble. Even more so if a policeman is standing nearby. Likewise, a torn banknote is absolutely taboo. It is not possible to pay with it, it will not be accepted. You can stick it or exchange it at the bank. If a Thai or anyone else talks badly about the king, stay out of it, dont confirm it either. When it comes to the King, keep a low profile and respect the country and the circumstances in which you are a guest.


Speaking loudly or even scolding is bad. This has to do with the loss of face that every Thai wants to avoid. Losing ones temper is equivalent to losing face.


Destroying symbols of the King and the country of Thailand can be punished by imprisonment. This includes the Thai flag as well as the banknotes and coins already mentioned. There have been these incidents several times, drunken tourists tearing or ripping a Thai flag or a picture or calendar with the Kings photo. Even if it was fun or accidental, this is forbidden by law. You can expect imprisonment, at least pre-trial detention. A lifetime ban from entering the kings territory is also likely because it has happened before.