re: Holding the door open for a female that doesn’t say thank you.

Had a funny experience regarding this a few years ago. I was walking into a building and a young woman was not far behind. I opened the door and stepped back to let her walk first. She gave me some gobbledegook about not needing a door opened for her. I looked at her and said “ if you don’t respect yourself, nobody else will either”.
I hope it made her think a little.