I could not agree more, and have said the same thing for years. In fact, I've always said that passing is a myth. The vast majority of us will get "clocked" the moment we invite anything more than passing notice (no pun intended), and It. Does. Not. Matter.
The social contract still applies in most situations and, by and large, people will treat you with respect, which is to say as the gender you are presenting. So smile, say please and thank you, and otherwise act like a lady.