Vietnamese people are very polite. Say hello or nod when you meet. Call Da Die, aunt or uncle to elders, brother and sister to peers, brother and sister to children, and folks, elders and compatriots to the masses (only used among China people). Jing people don't like being patted on the back or shouted with their fingers. When outsiders come to their home, toes are not allowed. They are not allowed to point their feet at people when sitting on the floor. They are not allowed to step over people sitting and lying down. They are not allowed to sleep in front of women's houses and in the aisles they often go to. They are not allowed to enter the master's inner room. In ethnic minority families, you must never go to the girls' room. Some ethnic minorities live in bamboo high-rise houses and are used to sitting and lying on the seats upstairs. Take off your shoes when you enter the house, or you will think you look down on your master. Young people especially respect the old. In the northern Jing nationality, the oldest man is in charge, while in the southern Jing nationality, the oldest woman is in charge. Generally speaking, they should be consulted about everything. As long as you agree, others will generally not object. Walking with the elderly, if you want to pass, you should say hello first, indicating that you are one step ahead. In ethnic minority areas, there is also the habit of respecting the elderly. For example, Dai and Lao people have stools for the elderly to sit on, and young people and foreigners are not allowed to sit on them.
Some ethnic minorities are very hospitable. When guests come home, they often entertain guests with their favorite wine and favorite dishes, such as cold dishes and hot and sour dishes. Therefore, guests should try to eat as much as possible even if they don't like it, otherwise they will be considered to look down on their hosts. Ethnic minorities in the southern mountainous areas like to invite guests to drink altar wine together at festivals, that is, they take turns smoking wine from the altar with their pipes. The first round (that is, drinking the first sip in turn) cannot be refused, otherwise it is considered disappointing and rude. After the first round, if you don't want to drink, raise your fist to your right shoulder with both hands to show your gratitude and stop drinking (the same is true when eating).
Vietnamese like to chew betel nuts. People usually wrap some ash or inkstone ash in reed leaves and eat it with betel nuts. Ash and betel nut will react chemically. The taste of chewing betel nut is bitter at first, then sweet, which has a stimulating effect on nerves. Betel nut is also a local token for lovers.
Don't touch other people's heads, including children. When there are green branches hanging at the village intersection, it is a sign of no entry, and outsiders are not allowed to enter. Khmer people in southern China are forbidden to salute, eat, deliver and receive things with their left hands. It is forbidden for Vietnamese to take photos with three people. It is considered unlucky not to light a cigarette for three people with matches or lighters.