My answer is one of those "it depends on what you mean by passing" ones. 🙂 Personally, my goal is to blend in with the cis women around me, so if I'm being treated identically to them - I tend to assume I've succeeded. (Reading the minds of strangers is a challenging proposition to say the least, so while sometimes it's obvious when someone is being "polite," the rest of the time I would take them at face value rather than drive yourself nuts wondering.) For a lot of people, treating someone according to their gender presentation *is* how they gender people - they would do the same to cis people, in other words, including misgendering a woman with short hair in men's clothes, because they're lazy and go with whatever cues they're handed. So that's not necessarily a "doesn't notice you're trans b/c you pass perfectly" so much as "doesn't CARE either way and didn't think about it," if that makes sense. But, hey, for many of us the goal is to get through our daily lives without being hassled or ending up depressed, and that'll do.
I have not been misgendered in public in years, but I admit I treasured the early "you know you pass" moments (there's a thread with a title like that) where somebody comments in such a way as to make it obvious that they assume I'm cis.
