"Ladies first" originated with Christendom, during which time not only was Our Lady honored, but all ladies. Boys were taught to open doors for women (including automobile doors), to pull out a lady's chair for her at the dining table, to carry a white handkerchief with them and to offer it to a lady if needed, and when walking with a woman to walk on the outside toward the road (to protect her from splashing of vehicles). My DH taught all of these to our sons.
The war on Chritendom aka Western Civilization is nearly complete, with many men and women ignorant of these traditions.