i've never had anyone just come up to me and ask me if i'm a transsexual, and i've never went over and told someone about me unless they are a really good friend. hell, even my one good friend i had known for a long time was surprised when i brought up something ts related. "you're trans??" lol.
anyway... i've known people who are like "i'm going to refer to them as they ARE, not as how they are presented" which is a load of bull. i don't let myself get pissed over it because i know they are just being douchebags about it. plus if they did that to me people would think they are crazy, lol.
i think the more signs you have physically from your past, the more likely it will be that you will be spotted. but having a couple features i don't feel will break you, even an adam's apple. i have one and it doesn't hurt me... and even if it does one day why should i care. i'm educated, attractive, i'm doing things with my life... if someone catches me as mtf, good for them. maybe they'll feel better about themselves for a mere moment. but if i let every bastard with "manswers" get to me i wouldn't be where i am today.
manswers... what a crock.