As they mentioned before it usually seems to happen to men who aren't used to it like teenage boys and virgins. It fits with this character since he was a virgin before... a certain scene.
Even in the case that a horrible accident occurs that results in your crotch being chopped off, it doesn't change the fact that your body is physically made with all that there. That's like saying you're no longer human if you lose an arm. Your biology includes a penis/testicles then you're a male. As far as being a male in your heart, i have no problems using your pronouns if it'll make you happy, but i'll consider you female till you get the operation because you are physically female.
You have it right, what i'm saying is that i would consider their body female and their character male. As far as you saying "it shouldn't matter unless the body is mine", it doesn't matter to me until that person comes into my bubble and tries to alter my perception of them. "hey, i realize that you've grown up understanding basic biology and so you view me as female, but i'm actually a male because my feelings adjust physical matter so i want you to call me male". If you ask this of me then it becomes my concern because YOU are involving me. It's really not a big deal to me, as i said, i'll call you what you want to avoid being an asshole. That bit about your body expressing your brain is just a convenient spin you like to apply, each piece of our body is the way it is because we evolved in this way to survive, if what you said was true then there wouldn't be any trans people because their body would adapt to their gender identity...
I just realized that there was more to your message than "thanks for the conversation!" : D I somehow didn't see the little plus symbol that shows the rest of the message... As far as whether or not i would be willing to alter my perception for a trans person who came out to me, no problem, i've actually already done that for my friend Louis (trans male, pre-op). I have no issues with altering my perception of individual people who're willing to talk and explain their situation and don't get rude with me, i just don't feel like i need to cater to people i don't know so if they get rude i don't believe they have any grounds to be angry on since i dont know them. As for you saying that "mental gender corresponds with bodily sex", i don't personally agree, if you believe that then where does it stop? Following that line of thought you could argue that something "went horribly wrong" in people who're gay/lesbian because their bodily sex is -insert sex- and yet they're attracted to the same sex, you'd even be arguing that they're gay/lesbian because they're a man or woman because "bodily sex is linked to what 'went horribly wrong' since, because they're -insert sex- they're supposed to be set to a certain setting and yet they aren't". Being gay/lesbian has already been proven scientifically to be attributed to environmental exposure and nurture, if what "went horribly wrong" in gay/lesbian people is already explained it's only a matter of time before we have the scientific details behind the "trans mindset".
You're right, you said "something went wrong" (by the way, my quotes are just there to reference things that you've said, they aren't indicitive of sarcasm or anger on my part, just wanted to clear up and misunderstandings), that was a mistake on my end. I realize that you never drew the comparison between "going wrong" and sexuality, i wasn't trying to say you did, the entire point of what i was saying there is that the line of thought you proposed is very generalized and could be applied to situations aside from being transgender. You were saying that their bodily sex is one thing and that since they don't associate themselves with the characteristics that make up that one thing something might've "went wrong", when you proposed this idea i responded with "well where does it stop?" because it is just a little too generalized. I went on to explain that sexuality has been attributed to environmental exposure to show you why making a generalization like that might not work in every case, the idea you proposed could be applied to sexuality, but since sexuality has already been explained in a way aside from what you were saying, it makes the idea invalid. TLDR, i was saying the idea is too generalized and could cover quite a few situations under the umbrella of it's ideology that have already been explained.

Ever noticed how there're SO many men who just can't help but precum all over the place while thinking about their love interest? He just precame enough to leave a wet spot not just on his underwear, but on his pants too. Without touching his dick. The sensitivity must be nice, though borderline debilitating. ╮( ̄▽ ̄)╭