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to turn the tables, I hold the door open for people, man or woman,a ll the time, and have been called names, including not a lady for holding the door open for men, but I will continue to hold the door open for people because it is polite.
and when someone get to the door before me and holds the door open for me, I will thank them. 
My friends and I would always start exaggeratedly looking around saying "Where!?" when someone referred to us as ladies. We always met this with a joke because we do many "unladylike" things in our diverse group like being called "Ms", hunting, fishing, riding, martial arts, weight lifting, yard work, wood work, fixing cars, shooting, fixing up the house, using chain saws, holding doors open for people, including each other, pulling chairs out for people, and so on.
if it really is about manners then men wouldn't get so bent out of shape about us holding doors open for them and pulling chairs out for them, something we do our of manners. we have this habit of who ever gets to the door or table first holds the door open or pulls the chair out for our partners.