In Danish culture you will soon discover the country has no direct equivalent to please in their vernacular, where the local version of Mr. and Ms. has all but disappeared from common usage, and where the people can hardly muster a sorry if they bump into you on the streets, you could be forgiven to think they are the rudest people on earth, and you can get away with pretty much anything. You'd be wrong.
Most of the behaviour many tourists consider appalling can be attributed to either the Danes' blatant - and when you get to understand it, quite sympathetic - disregard for formality, or their unfortunate shyness, and there are rules to the madness, way too complex to get into here, but some of the most important ones can be summed up as follows:
It is generally not considered impolite to omit verbal formalities common in other cultures, such as generic compliments or courteous bromides. Likewise, Danes seldom use Sir or Madame to address each other, as it is perceived as distancing oneself. On the contrary, addressing (even a stranger) by the first name is considered a friendly gesture.
Be punctual, few things can make the Danes more annoyed than showing up later, even by a few minutes, than the agreed time, save social gatherings at people's homes, where the requirement for punctuality is much more relaxed.
If there are free seats on a bus or train, it's not customary to seat yourself next to strangers if you can avoid it. It is also a nice gesture to offer your seat for the elderly and the disabled. In many busses, the front seats are usually reserved for them.
Be aware that there are marked "quiet zones" on each train: one in the back of the back wagon and one in the front of the front wagon. Don´t talk on the phone. Don't talk at all. These are for people who want a quiet trip, usually people who need to go far, and may want to sleep, read, or work on their laptop or other things in peace.
Danes try to abridge differences between social classes. Modesty is a virtue - bragging, or showing off wealth, is considered rude, as is loud and passionate behaviour. Economic matters are private - don't ask Danes questions like how much they earn or what their car costs.
As in Germany, Britain, and the rest of the Nordic countries, the weather is a good conversation topic.
Greetings between people who know each other (e.g. are good friends, close relatives, etc.) are often in the form of a careful hug. It is rare to see a peck on the cheek as a form of greeting, and it might be taken as way too personal. A handshake is customary for everyone else, including people you aren't close to and people you are being introduced to.
When invited by a Dane - to visit their home, join them at their table or engage in an activity - don't hesitate to accept the invitation. Danes generally don't strew invitations out of politeness, and only say it if they mean it.
The same goes for compliments. Bring a small gift; chocolate, flowers or wine are the most common, and remember despite their disregard for formality, to practice good table manners while at restaurants or in people's homes.
Even though 82 per cent of the population is officially Lutheran, Denmark is by and large an agnostic country. Investigations into people's faith are largely unwelcome, and outside places of worship, displays of your faith should be kept private. Saying grace, for example, is likely to be met with bewilderment and silence.
Religious attire such as Muslim headscarves, kippahs or even t-shirts with religious slogans, will - while tolerated - also make many Danes feel uncomfortable. If someone sneezes do not say "Bless you" under any circumstances, instead say "Prosit" or "Gesundheit" ("Prosit" is highly recommended since it's the danish way of saying it) However, words like "Oh my god" is welcome. Going to church is highly unpopular, most parents dislike it as much as their offspring.
If in Denmark on business, it's important to note that family nearly without exception takes priority overwork. So don't be surprised if Danes excuse themselves from even the most important of meetings by 4 pm to pick up kids, a burden equally shared between the sexes.