> They've told me that being treated as "superior"...
You've mistaken an example for the concept. I chose the example to show that we have so much choice in how we interpret actions that can easily make the same action imply intentions that are polar opposites. I didn't choose it as an example of a positive interpretation. The point is that the interpretation of an action is separate from the action which itself is separate from the intention behind the action.
> You're right, but saying "ladies first" makes many women feel patronized - not a good thing.
Do you think I don't also talk to women about their feelings? Your comment comes across as patronizing. It suggests women lack emotional maturity and they need you to speak for them.
Object to an action on its merits, not on your perceived view of how women feel.
> I'd say to those people: even if you learned that "ladies first" is good manners, that doesn't mean it still is.
This is how some types of abusive relationships play out:
1. Interpret a behavior in the worst possible way.
2. Feel badly about it.
3. Blame the other person.
4. Demand some type of behavior from the other person so you don't feel badly.
I think there would be some merit in objecting to "ladies first" as sexist. It is inherently sexist, although not necessarily misogynistic. (Holding a door open, on the other hand, is not sexist per se.) But objecting to "ladies first" based on third hand accounts of someone's interpretation of another person's intent is weak, convoluted, and utterly unconvincing.
Edit: List formatting.