Comment by Zak

The cultural and legal expectations around photographing people are very different in Germany than in most English-speaking countries, and especially the USA. In Germany, taking photos of people without permission is socially unacceptable, and sharing such photos is usually illegal.

In the USA, photographing people from somewhere the photographer has the right to be is protected as freedom of speech with few exceptions, and is less likely to be seen as rude. Of course a business can still impose its own rules of conduct inside.