I kind of doubt that people are not passing sometimes. Of course, I was misgendered right in front of this friend of mine who thinks I would pass all the time (I don't). But sometimes "friends" who knew you prior, can be particularly harsh. Mine aren't but that's likely to be my age. I am guessing that there is some percentage which people "pass" at and not passing is strange as I can pass in the same place in the same day (happened yesterday in fact). Who knows why? We are fairly sensitive to it, but I imagine it happens to cis guys, esp those with a more femme presentation or a higher voice.
It's probably a good reminder, but be yourself, I think people will eventually come around. 10 months isn't the history of the world so that one would expect this, I'd think.
--Jay