Hey, c'mon, you don't needa start saying stuff like that. I'm pretty sure all that happened here is that there's been a misunderstanding -- what's bein' requested here is to change the Gender entry thing so that people can put in whatever they want (or at least to add a third non-binary option), not to add an extra thing to the menu and make a split between Birth Gender and Preferred Gender that would only make people feel less at home here and doesn't really serve much of a purpose. We don't write our blood types or eye colours into those fields, ya know?
It also wasn't asking "How can this be done", because the site actually already has programmers working on it. Which is fortunate, because building something like this out of just good samaritan forum responses would take a very very long time.
I don't really think DeviantChap was being that hostile, but he maybe might've been a bit on the defence from of the implications of you suggesting Birth and Preferred Genders to be different fields in a setting that didn't mention it before. I know it was just because you misunderstood what was going on and were trying to help, so no worries there, but you can see how someone might take that as you trying to change the implementation so that it isolates trans and non-binary people. Of course, that's not what you were doing at all, you just made a mistake! And you even edited your first message to make it look less like that. But most of the time when you're talking to people, you've gotta respond as if they're not making mistakes, because assuming that they are and checking every time would make conversations take ages.
So yeh, thanks for the suggested way to help, and good on ya for going back and editing "Real Gender" to be "Birth Gender" in your first message! I think all that happened here is you were a bit mistaken about what this post was for. No need for hostility on either side from here! You just skim-read something and tried to help out with a message that happened to only sorta-apply, that's all.