I read some study about it a few years back… in summary, americans are doing the fake friendliness thing where they ask everyone and their mother how they are doing, if they want to grab coffee sometime, and so on while actually meaning nothing of it. Meanwhile Europeans don’t do that. They are only really friendly to people they are familiar with, and immediately sceptical of the American kind of fake friendliness. Basically, we wouldn’t ask someone how they do unless we are actually interested in that.