I really respect people who edit comments to acknowledge when they're wrong, but leave the original mistake intact (but usually strike through). Like this:
~~I delete my comments when I'm proven wrong because it's embarassing and I don't want to perpetuate misinformation~~
Actually, I'm leaving my mistake up, because then people can follow the conversation easier and see how I came to realise I was wrong
I've heard from a few transfem lesbian friends that one of the hardest parts of coming out to themselves as trans was that it would also mean acknowledging they're not straight, because if you're someone who feels like you're failing at being a man, attraction to women can be pretty grounding. "It was the one normal thing about me" - whole lot of internalised misogyny/transphobia/homophobia.
Quite right; labels like straight get pretty wibbly in situations like this. I find it sad because the current prevalence of homophobia and transphobia makes it hard for us to collectively understand what would it mean to be a cis-het femboy who takes HRT — for us to conceptualise of a world where that isn't a contradiction. Bigotry makes it harder for people to explore their true selves, regardless of their gender or sexuality.