I understand that this specific situation and individual caused you a moment of thoughtful deliberation on the subject of sexism, however, I would caution you on the idea that all men are like this. Were that to have been me, I still would have offered to get the first door for you, but only because I would be going though it as well. There are men out there who still utilize common courtesy, and I am one of them. At the same time, I have not only had the tables turned, where a woman has held the door for me, to which I promptly said thank you, but have also been chastised for being sexist. I wish women who are like that, who mistake common courtesy for sexism and chivalry, would take a second and ask if they are expressing reverse prejudice. I wouldn’t, when that happens, have an intense desire to slam the door in their faces and say that I was just being courteous.