Wherever you are in the world there is always things that you can and can't do this goes same in Thailand. Following a few simple rules of Thailand etiquette will not only prevent you from accidentally offending someone. Thailand is known as the “Land of Smiles” but the famous Thai smile has many meanings. Although Thai people are very forgiving of infractions, particularly when committed by farang (foreigners), observing these basic dos and don'ts will keep them smiling.
These are the things you should'nt do in Thailand ;
Don't point your feet: Pointing your feet at someone, raising your feet higher than someone's head, or simply putting your feet on a desk or chair are considered extremely rude in Thailand.
Don't touch someone's head: While the feet are considered the lowest and dirtiest parts of the body, the head is revered as the most sacred. Never touch someone's head or hair - this includes playfully ruffling a child's hair.
Don't point: Pointing at someone is considered rude in many cultures but particularly so in Thailand. If you must indicate a person, do so by lifting your chin in their direction. When motioning for someone to come over, don't use fingers pointed upward; make a patting motion with your fingers straight and palm toward the ground.
Don't lose your cool: Shouting, blowing your top, or displaying strong emotions is generally frowned upon in Thailand.
Don't disrespect the king: Never disrespect the king or images of the king, this includes currency.
Don't throw things: Tossing an object or money in someone's direction is rude. Take time to hand things to people properly, face-up, preferably with your right hand. Unfold money when paying someone.