From my experience in Germany, the Netherlands and Belgium, this is a terrible map lol. I've never been in a house that asked me to take shoes off in those countries. I usually do because I find it nasty as shit to walk around with shoes and hate when people do at my house (I pretty much only let friends with high shoes/heels during events, because that's something they are actively trying to do to their image). But the fact that those countries aren't blue or green is very suspicious.