Aside from actual trans people fearing they aren't passing, they are that fragile. It likely stems from insecurity. I have people misgendering me online and I don't care. I have people calling me a man to try to insult me and I don't care. And before any lurking transfats jump in and call me cis scum that needs to check privilege, I am agender. I could claim triggers and cry about being misgendered but that would require two things to happen: 1. I would have to be oblivious to society. 2. I would have to care very deeply about something so benign. Not happening.  Some of these special snowflakes have asked me for my pronouns and I just reply: "My pronouns are 'I don't care'."