Explanation
In Vietnam, the feet are considered the lowest and dirtiest part of the body, so showing the soles of your feet to others, especially in a social gathering, is seen as a sign of disrespect and contempt. This gesture can offend elders and hosts, as it implies you are looking down on them or treating them as inferior.
Local Tip
Always sit with your feet flat on the floor or tucked under you, and never point your feet at anyone or any sacred object like an altar.
How it compares elsewhere
The feet are considered the lowest part of the body; pointing the soles at someone is a grave insult, especially in temples.
Showing the soles of your feet is impolite, particularly in traditional settings like tatami rooms.
Generally considered casual or rude depending on context; putting feet on furniture or pointing soles at someone can be seen as disrespectful in formal settings.