UJM:
Chivalry has no basis in Yiddishkeit? What on earth do you call Aishes Chayil? Is there an explicit Torah source for opening the door or walking a girl out of the car? Maybe not. That’s no excuse not to be a gentleman. Going above and beyond never killed anyone, not is it inappropriate.
Also, for the record, such chivalry would actually be considered more CONSERVATIVE. “Liberals,” as you would call them, would more likely be offended by the notion of chivalry as it has connotations of females being the “weaker” gender. But I wouldn’t want to get in the way of your blaming everything on liberal Americans, so by all means…