You can control what you do. You cannot control what someone else does. And rude is in the eye of the beholder. I live where I have to travel some gravel roads to get out. Often, when I meet a car, they stop and let me drive by. That sounds courteous, doesn't it. And to them I'm sure it is. But when they stop at a narrow place in the road where I have to hug the edge to get by, I find it would be more courteous if they just came ahead a little and let me pull over at a wide part of the road. Then there was the time I was walking and a car came up behind me. I moved over in the chigger infested, dew-soaked weeds on the side of the road, and kept walking, waiting until they caught up to me so I could stop, turn and wave as they went by. I'm sure they thought they were being courteous by slowing down and creeping along behind me, being very careful to not gain on me. The would not pass me or even get that close to me, forcing me to stay in those wet chigger and tick infested weeds, until I stopped, turned around and waved them by. They were being so nice to me, in their eyes anyway, how could I really be upset?
Then there was the lady at the Post Office who was so downright rude and short that I really worked to get a different clerk if I could. But when her cancer went into remission, she became a very pleasant person. I understand that sometimes people are preoccupied.
I do consider it rude to let a door go into someone's face. But I figure it is my job to not get hurt if somebody does let a door go in my face. I figure it is my job as a pedestrian to not let a driver run over me. If I'm driving, I expect that idiot to run a red light or stop sign or fail to yield at a 4-way stop. I can control what I do. I cannot control what someone else is doing, but I can be aware of how other people's actions can affect me and mine, especially when they are not clicking on all cylinders, whether because something else is going on in their life or they just don't click on all cylinders.