I disagree with Frye's statement about when a man holds a door for a woman it is oppressive. She says, "the door-opening and similar services provided are services which really are needed by people who are for one reason or another incapacitated - unwell, burdened with parcels, etc. So the message is that women are incapable (page 177)." According to freedictionary.com the definition of oppression is: To keep down by severe and unjust use of force or authority. Personally I don't see how holding a door open for someone is keeping someone down, in my opinion it's chivalry.
Personally, I think that holding the door open is just the right thing to do when someone is behind you. I work as a hostess at a local restaurant, and I open the door for everyone, and people are always surprised and taken off guard, as if it has never happened to them before.