Yesterday I watched the following video on Facebook: America Vs: Shoes At Home. In that video, it's argued that wearing shoes inside the house is inappropriate, mainly because it's not hygienic, but it's also mentioned that in cultures outside the United States, taking off one's shoes when entering a home is a sign of respect.
One of the arguments the video uses against wearing shoes inside a house (at 1:34) is that "the U.S. is actually one of the few countries where shoes don't come off at the door." However, the video only explicitly mentions (at 1:43) Japan, India, Denmark, Germany and China. Even their source for the claim (25 common American customs that are considered offensive in other countries) only says that "in most Asian and Caribbean cultures it is expected that you take your shoes off when entering someone's home."
I also found this link on Quora: Do people wear shoes indoors in countries other than the US?, where people mention (seemingly from personal experience) some countries/cities where wearing shoes inside is normal (Australia, the UK, Spain, Paris, Amsterdam) and others where it's the opposite (Canada, Syria, Turkey, Singapore, India, Korea, the Scandinavian countries).
From my own personal experience living my whole life in Chile, it's perfectly normal here to wear shoes inside. I've been in Argentina and Mexico, and I was never asked or even suggested to take off my shoes inside the houses I entered while in those countries, either. Also, I've never heard about any country in South America where taking off one's shoes is the norm.
How many is few?
Regarding the meaning of few, Merriam-Webster says that "from the very beginning, few was used of a comparatively small number." However, I understand that few is commonly perceived as a small number in general. Personally, I wouldn't consider few anything more than a third when comparing to a known total amount, but I see that the definition is vague.
Using the commonly perceived meaning of few in the United States of America (whatever it might be), can it truly be said that, in few countries, taking off one's shoes when entering a home is not normal behaviour?