I don't mind it - a remnant of a time long gone when gender roles were more clearly defined, and it's just nice to be recognized and treated as female once in a while. A door held open for me is as pleasant as being "ma'am"ed, a harmless gesture that rights some small part of my prior life.
Doesn't happen often though. The last person to treat me overtly as female was my endocrinologist, the sweetest and most understanding person I know when it comes to that kind of thing. Held my shirt for me as I put it on, a real gentleman. Of course, that was moments after he had felt my tits, fondled my balls, and stuck his finger up my ass

, so I guess pretending I was a girl was the least he could do...