I think it's well-established in this thread that there can be lots of reasons for holding a door for someone. But I assume you don't deny that some men do so for women specifically based on the view that women are entitled to certain social niceties based purely and exclusively on their status as women? That's the attitude that I would define as "chivalry," and I think it can be distinguished from a general gender-neutral politeness, and even from non-gender-neutral romantic/sexual interest (both of which I see no problem with as a motivation for doing nice things for strangers of the opposite sex). I really don't see how it isn't the case that the social norm of chivalry, as distinguished from those other things, carries with it an implicit judgment that women are less able than men to fend for themselves without special assistance. How that isn't a condescending attitude is just beyond me.