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

"In Selfoss, it's considered rude to not remove your shoes when entering someone's home. Always remember to do so unless the host insists otherwise. Icelanders value their personal space, so avoid standing too close to someone or touching them unless you know them well. It's considered impolite to be late in Iceland. Always try to be on time for any appointments or social gatherings. Avoid discussing whaling as it is a controversial topic in Iceland. Many Icelanders have strong opinions on this issue and it can lead to heated debates. Do not litter or harm the environment in any way. Icelanders are very proud of their natural landscapes and work hard to preserve them. Avoid comparing Iceland to other countries or implying that it is part of Scandinavia. Icelanders are proud of their unique culture and heritage. Do not expect service staff to be overly friendly or chatty. In Iceland, it's common for service to be efficient and polite, but not necessarily warm or personal. Avoid making loud noises or causing disturbances, especially in public places. Icelanders value peace and quiet. Do not assume everyone believes in elves or the supernatural. While these beliefs are part of Icelandic folklore, not all Icelanders believe in them and some may find it offensive to be stereotyped in this way. Lastly, tipping is not customary in Iceland, so there's no need to leave a tip at restaurants or for other services," said another expat in Selfoss, Iceland.