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

"In Egilsstadir, it's considered rude to not remove your shoes when entering someone's home. It's also important to respect the local belief in elves and hidden people, as many Icelanders take these folklore tales seriously. Avoid comparing Iceland to Greenland or any other Nordic countries, as Icelanders are proud of their unique culture and heritage. It's also considered impolite to litter or harm the environment in any way, as Icelanders are very environmentally conscious. Public drunkenness is frowned upon, despite the popularity of alcohol. Lastly, tipping is not customary in Iceland, so avoid leaving extra money at restaurants or for services," remarked another expat who made the move to Egilsstadir, Iceland.