I don't get bothered when I am called "sir" whether or not I'm "trying to pass." It has nothing to do with what "mask" I'm wearing that day. If they call Dapper Dan "sir," then they're addressing me in a respectful manner. They "ma'am" me, and they're possibly mocking me. That or they noticed the tight leather pants I chose that day. Though I have tried tight pants with a convincing pack, most people who know I'm "really" a girl tend to assume it's a "natural fold of the cloth" and think nothing of it. But in all honesty, being male, when I'm addressed with "sir" I am not "ecstatic" nor am I disappointed. I don't see why I should get a rush from it or reject the idea. It's a tad obsessive when one is thriving in pleasure when they hear the proper pronoun; that behavior borders on the line of fetishism. Though I must say the first time it happened I was quite gleeful that I was acknowledged.
I get "sir"ed and I don't mind because I am a guy. The argument is about my sex, not my gender. So if someone says I am male, I'm going to have to say "not yet," because my legal designation is female and will be female until I start HRT and move through the legal process of changing my legal sex. Then saying I am male won't be a lie anymore, unless someone is asking for the purpose of my physical sex (like a doctor), in which event I will have to tell them I am a transsexual male.
My voice makes me seem younger, not female. I am 5'3", have a mild voice (not deep, not high), I obviously have no facial hair and I'm quite thin. So I'm often mistaken as a 13-16 year old boy who's a little slow with puberty. It's unfortunate because I am an adult who is capable of adult jobs.
Now, I certainly can't pass as male in a dress, because I was given a pretty "amazing" female body... it's unfortunate because many girls would kill for my bone structure and body composition. If I wear anything feminine, it immediately shows off those features. All I lack is a "good pair of breasts," which I'm quite thankful for because I don't have to bind.
Overall, when I am "sir"ed I like it because it matches my "style" and persona. I am an actor, so it's often hard to come out of that acting boat. However, that does not mean I am a walking characature. It simply means I like to dress oddly in order to express myself sometimes, often in the form of suits or work clothes, as that is really something I aspire to... Not just that, but I feel that I look incredibly good (and masculine) in these arrangements. I keep wanting T because it for sure will top off my look and no one will ask anymore. They'll just know.