The only time I've ever been confused was when I met an outspoken lesbian feminist who yelled at me in front of lots of other people for daring to hold a door open for her
I let her rant for several seconds, not interrupting her (another discourtesy I hate) and let her smack me on the arm and still remained my composure
When she'd finished, in a loud enough voice for everyone else to hear I offered my considered but 'off-the-cuff' reply
"So I guess that means an (oral sex act) is out of the question then ? "
I received a standing ovation
-- she was entering the room and didn't know what to do with herself, where to go, or what to do, so she skulked off and was mocked & derided by pretty much everyone for the rest of the day
I still, and always have, held doors open - not just for a lady but for anyone else - its who I am
Courtesy and integrity costs nothing but is commonly sold nowadays for a pittance