Singaporeans don’t go much for formal politeness and what would be decent behavior at home (wherever home might be) is unlikely to offend anyone in Singapore either. In Singapore, unlike much of southeast Asia, women wearing revealing clothing or men wearing shorts and slippers are perfectly acceptable, although upmarket bars and restaurants may enforce dress codes. Toplessness for women, though, is not acceptable anywhere, even on the beach.
Casual conversation — for example, greeting a shopkeeper — isn’t really done in Singapore, and you may get strange looks if you try. No offense is intended, Singaporeans are just protective of their personal space and showing courtesy by trying not to impose on others. Furthermore, the local dialect with its heavy Chinese influences may appear brusque or even rude, but “You want beer or not?” is in fact more polite in Chinese — after all, the person asking you the question is offering you a choice, not making a demand!
If invited to somebody’s house, always remove your shoes before you enter as unlike in many Western countries, most Singaporeans do not wear their shoes at home. Socks are perfectly acceptable though, as long as they are not excessively soiled. Many places of worship also require you to remove your shoes before you enter.
At rush hour, be prepared for a lot of pushing on the MRT (even just to get off) and everyone racing for the empty seat. This is normal, despite signs asking people to be a little more courteous. Just go with the flow.
Beware of taboos if bringing gifts. Any products (food or otherwise) involving animals may cause offence and are best avoided, as are white flowers (usually reserved for funerals). Knives and clocks are also symbols of cutting ties and death, respectively, and some Chinese are superstitious about the number four. Many Singaporean Muslims and some Hindus abstain from alcohol.
Take dietary restrictions into account when inviting Singaporean friends for a meal. Many Indians (and a few Chinese) are vegetarian. Most Malays eat only halal food, while most Indians, being Hindu, abstain from beef.
Business
Singaporeans are punctual, so show up on time. The standard greeting is a firm handshake. However, conservative Muslims avoid touching the opposite sex, so a man meeting a Malay woman should let her offer her hand first and a woman meeting a Malay man should wait for him to offer his hand. If they opt to place their hand on the heart and bow slightly instead, just follow suit. Singaporeans generally do not hug, especially if it is someone they have just met, and doing so would probably make your host feel awkward, though it is unlikely to cause any offence.
For men, standard business attire is a long-sleeved shirt and a tie, although it’s common to skip the tie and open the shirt’s collar button instead. Jackets are rarely worn, because it’s simply too hot most of the time. Women usually wear Western business attire, although a few prefer Malay-style kebaya and sarong.
Business cards are always exchanged when meeting for the first time: hold yours with both hands by the top corners, so the text faces the recipient, while simultaneously receiving theirs. (This sounds more complicated than it is!) Study the cards you receive and feel free to ask questions; when finished, place them on the table in front of you, not in a shirt pocket or wallet, and do not write on them or otherwise show disrespect.
Business gifts are generally frowned on as they whiff of bribery. Smalltalk and beating around the bush is neither necessary nor expected, and most meetings get straight down to business.