What cultural faux pas should I try to avoid making in Phú Quoc Island?

"When visiting Phú Quoc Island in Vietnam, it's important to respect local customs and traditions. Avoid wearing revealing clothing, especially when visiting religious sites, as it is considered disrespectful. Always ask for permission before taking photographs of locals, as some may find it intrusive. Avoid public displays of affection, as it is not common in Vietnamese culture and can be seen as disrespectful. It's also important to avoid discussing sensitive topics such as politics and the Vietnam War, as these can be seen as offensive. When dining, avoid sticking your chopsticks upright in your bowl of rice, as this is considered bad luck. Also, remember to use both hands when passing items, especially to someone older or of higher status, as using one hand can be seen as disrespectful. Avoid touching someone's head or pointing with your feet, as the head is considered sacred and the feet are considered the lowest part of the body in Vietnamese culture. Lastly, always remember to bargain when shopping in local markets, but do so respectfully and without being overly aggressive," said another expat in Phú Quoc Island, Vietnam.