Having lived for long periods in the USA and Nigeria and visiting other continents as well, I can assure you that each culture has an idea of what's appropriate

Having lived for long periods in the USA and Nigeria and visiting other continents as well, I can assure you that each culture has an idea of what's appropriate whether they use that specific word or not. Never been to Germany (I've visited 5 of its neighbors), but no matter how open or permissive Berliners consider themselves, I feel it's likely they "don't care" about certain things - a lot of people take things for granted that everyone in their culture accepts as a norm or a line that shouldn't be crossed and I'm sure there are bound to be some of those in Berlin whether you perceive them or not.