Behaviour towards women [View all]

To this day, I'll hold open a door for a woman and let her enter before me. When my ex and I are to drive somewhere, I'll open the passenger door for her and when she gets in, I'll close it. I address women older then me who I do not know as "Ma'am". If I'm sitting in a room visiting people and a woman my age or older enters, I'll stand and if there are no other seats available, I'll offer mine. If there is a woman behind me in a checkout who has fewer items then me, I'll ask if she wishes to cut ahead of me (I don't do that for guys.).

Is this sexist behavior or just good manners?