Is it really polite to call a woman "ma'am"?

Anonymous
The reason I ask is because today had an incident. Like 6 people wanted to enter the room. I held the door for everyone and the last guy that went in said "thank you ma'am"! I knew he was been respectful but at the same time the word really bothered me because it made me few old, damn it I'm only 27, I thought a "thank you" was enough. Anyway, is this word that bothers me, I'm not so sure if it's all polite or if it's also an indirect to a woman's age. What do you think? Feel free to share your opinion!
Is it really polite to call a woman "ma'am"?
22 Opinion