What cultural faux pas should I try to avoid making in Tanjong Pagar?

"In Tanjong Pagar, it's important to respect the local customs and traditions. Avoid chewing gum in public as it's banned in Singapore. When using chopsticks, don't stick them upright in your bowl of rice as it's considered bad luck. Also, avoid pointing with your index finger as it's considered rude; instead, use your whole hand to gesture. It's also considered impolite to touch someone's head as it's seen as the most sacred part of the body. When visiting religious sites, dress modestly and remove your shoes before entering. Avoid discussing sensitive topics such as politics and religion. In Singapore, it's customary to give and receive items with both hands, especially business cards. It's also important to remember that tipping is not customary in Singapore, and can even be seen as insulting in some cases. Lastly, always remember to queue and wait your turn, as skipping the line is considered very rude," said another expat in Tanjong Pagar, Singapore.