What cultural faux pas should I try to avoid making in Sai Kung?

"In Sai Kung, it's important to respect local customs and traditions. Avoid discussing sensitive topics such as politics, especially issues related to China and Hong Kong's relationship. It's considered rude to point with your index finger, so use your whole hand instead. When using chopsticks, don't stick them vertically into your bowl of rice as it's associated with funerals. Also, don't tap your chopsticks on the edge of your bowl, as it's seen as a sign of begging. Avoid touching people's heads as it's considered disrespectful, the head is seen as the most sacred part of the body. When giving or receiving gifts or business cards, use both hands as it's seen as a sign of respect. Also, it's customary to inspect a business card carefully before putting it away, as a sign of respect towards the person who gave it to you. Avoid wearing white or black to weddings as these colors are associated with funerals. Red is considered a lucky color and is often worn at celebrations. Lastly, remember to respect personal space and avoid excessive physical contact, especially with people you've just met," mentioned another expat when asked about moving to Sai Kung, Hong Kong.