To be frank, I've had a similar experience before. I don't care if you're young or old, black or white, male or female. I'll generally hold the door for you, just like I tend to use "sir" or "ma'am." Nothing conspiratorial about it, but the only time I've had someone give me shit for being polite it's been that same kind of situation. College campus, feminist bullshit.
Your recent comments have been almost nothing but the type of ideological snipes that we've asked you already not to post. Would you please stop?
I've been called out once for "ma'am" because she didn't want to think of herself as being old enough to be called such. (that's a fair beef). Twice because I mis-gendered somebody. Once I got yelled at for 5 minutes because I opened/closed the passenger-side car-door. On a date!
I support gender-equality, but it would also be super if we would just learn to be kind to one another, babies.
On the other hand, I don't care if bad-mannered people react negatively. I don't mind if it's because they just didn't receive an education or because they received an ideological one.