I've had this friend for over thirty years now, I first met her in her last year of high school, the year I had started uni. Never felt attracted to her and we got along very well platonically. Over the years we have drifted in and out of each other's lives and currently have a pretty good connection. I never told her about my first attempt at transition, she has always been fairly religious (her younger sister even more so) and I just figured she'd be too conservative about that kind of thing to understand or cope.
I did tell her this time though, I didn't really have much option since I had offered her some casual IT relief work through my employer and would be her supervisor for three weeks plus I would be transitioning to full time right at the start of her contract! She took it really well though. When I told her I was trans her response was "oh sweetie, I've always known!" She was really supportive and even sent me a little gift with "Grace" engraved on it. Very sweet. Since I was pre transition when I told her I gave her a couple of pics of me as Grace so she at least knew who she'd be talking to on the phone (her job was to be working from home).
Anyway that was four months ago. She recently told me that she had put my pic with a few others of cis women and asked her friends (people I don't know) if they could "pick the transsexual". She wasn't doing it as a joke, just as a bizarre experiment to satisfy her curiosity about my passability I guess. I suppose I should feel flattered that out of the four choices given I was picked about 25% of the time, meaning nobody had a clue.
But still... WTF??

Have to say I wasn't really impressed but I let it slide and yes, she is still a friend.