I hate it when people wont hold a door for someone when the opportunity is obvious. I don't expect anyone to to just stand there and wait, but it is very rude when another person is right behind you.
One time as I was walking to the bank entrance, I overtook an elderly gentleman when he was about 10 feet out from the door. He gave me a dirty look, but his reaction when he realized I was just trying to get the door for him was priceless.
I don't remember who said this, but I remember a quote about opening a door for a woman that goes something like this:
"I didn't open the door because you are a woman, but because I am a gentleman."
Another time I was trying to enter a convenience store. The doors only opened into the inside. Someones kid was playing around in front of the doors, so I waited until he moved out of the way to enter. Of course, as soon as I pushed the door open, he ran right toward me, and smacked his head. His mother gave me the dirtiest look. I just thought, well he's your kid, why are you mad at me?
Of course, none of this is on topic, but I think that in my neck of the woods (K.C. area), women are much more abusive of the whole door curtisey(sp?) thing.
just my opinion.