I would have said, "Yes I am. And you?", smiled, turned, and left.

On the idea that females don't conform, I find this hard to believe. Walk into any busy mall, any busy airport, train station, etc, where there are thousands of females and you might find fewer than 5 whom you cannot tell are female ... and these would be the few women who make a concerted effort to look butch, but even then it is apparent to most of us that they are indeed female. If members here find it difficult to gender people, then I wonder if they might not have the ability to look at people like the rest of us.