I don't understand this insistance that no tranny ever passes.
Trannies have the highest likelihood of passing in brief encounters where they don't speak much and otherwise maintain a relatively low profile. The longer you spend time around them, the more obvious it becomes, but as another poster wrote a lot of it is just about general perception - if you're not really closely paying attention to people, then yes, some can fly under the radar here and there. But all day, every day, for decades on end with every single person they encounter? You're never hitting 100% with those numbers.
Personally, when I think of passing, I don't think of things like "passing when you walk by them in a grocery store" because if that's your only metric for passing then obviously that's not a very hard bar to clear. Instead, I think about extended exposure such as with coworkers, neighbors or other people you see on a more frequent basis, because that's when the little tells start to really add up, especially around gait, body language and overall presence. Sure, a tiny chick with a frog voice might not raise your suspicions when you're drunk in a dark nightclub, but odds are likely you're going to start noticing
something when you see her day in and day out at the office over the course of several years.
(Unless you're one of those people who tries to ignore as much about your coworkers as you can so that you can get your paycheck and leave, which I respect as a modus operandi for wage slaves.)
Ultimately, everyone passes a lot more effectively in a digital era where even normal people are retouching every picture we take and giving ourselves bigger eyes, clearer skin and whiter teeth through apps; it's really the second you see them IRL that it becomes vastly more difficult to ignore.
Honestly, it's probably why so many troons 'n' poons live most of their lives online - it's easier to control the perception of others when the only way they see you is after you've manipulated your picture through angles, lighting, artistic cropping and Photoshop commands. On the outside, you have to account not just for your appearance at face value, but everything else, and that becomes far more challenging.