True exchange during my Feminist Theory classes at university (I am a feminist):
My best friend opens door for Alice:
Alice (haughty but smart): "You don't have to do that because I'm a woman."
My best friend: "No, Alice, I'm doing it because I'm a gentleman."
Also from an early age I was aware that some older people expected me to hold doors open for them as if it was what I was born to do, without a "thank you" to encourage me to repeat the process. I soon learned a way to get my own back, I still remember the first time:
Having held open a door for an elderly man, who just walked straight through, I said "Pardon!" (quite loudly). The man turned and said "I didn't say anything" to which I replied "Sorry, I thought you said 'Thank You'". I'd never seen a face turn so red so quickly.