When I'm opening a door, how far behind me does someone have to be before I am not obligated to hold the door open for them? Two, four, ten, twelve steps? Honestly, this sort of thing causes me a lot of anxiety. Because inevitably, due to my bad judgement, I'll hold the door when someone is too far away and they will then feel compelled to run to get to the door as they don't want to be seen as taking advantage of my kindness. And I didn't want that, I just wanted to be nice and hold the door open for them. When people do run, I usually say "no hurry." And I mean it. Of course, the flip side is that I don't hold the door and they now think I'm that guy who has no common courtesy. And it makes me sad to even think I could be "that guy".
I'm hosed either way. Maybe I should just start slamming doors in people's faces. Of course, that would bring lawsuits. I don't want those, either.