It’s not that, it is when someone (correctively misgenders) as in they got the right gender and then when they catch a hint you might be trans or see something that points to your AGAB they switch it up and miss gender you. That is what the OP is about and I think this is what the comment was also referring to aswell.
The OP is based on the common occurrence of this for MTF individuals, especially those that have grown out our hair… while someone may gender us correctly from behind, they sometimes (correctively misgender) when you turn around. This can be done with the best intentions in mind, like they thought they misgendered a guy as a girl, so they apologize despite the fact that the apology is in fact an insult at that point.
I remember the first time someone called me miss in public I felt amazing, the second time it happened it crashed when they apologized and said sir. Instead of getting off work that day giddy because I was called miss, I spent the rest of the night disgusted trying to deduce what features made them question their first thought.