The very first time I publicly dressed as myself and presented myself to my mom: "I don't see it."
Later that evening I went to a local trans group's meeting where I was put under a hot spotlight: "What's your girl name? You can't be transsexual because you're not tall/left-handed/have arched eyebrows/etc. You're just a crossdresser."
That night destroyed my self-esteem and confidence and set off over a decade of transphobia in myself. I didn't want anything to do with other trans people in person and I was always, always looking over my shoulder, always feeling each and every person's eyes on me, caused me to be afraid to walk into my front yard, and it stoked that Imposter Syndrome to the point that when my husband asked for a divorce I couldn't face living alone as this vulnerable person so I did the unthinkable and went back to presenting as male. This has been the worst 2-3-year experiment of my life, but at least it's set in stone in my mind that yes, I am, in fact, a woman, and there's nothing I or anyone else can do about it.
Trans hierarchies piss me off and I'll have nothing to do with them.