Evidently from now on, you have to greet people on community lots as well. There is no change in relationship (except if they were unknown, in which case you may call them later). Overall it is a big waste of time and nothing more. When someone comes to a coffee shop, they will first spend a couple hours autonomously trying to greet everyone, including the people who are already drinking coffee, rather than just buy their own coffee and sit down. Semi-realistic, depending on what the community lot is meant to be, but another time sink.