The vitriol seems to be directed at the general concept, not the OP though.
(And I'll give the benefit of the doubt until someone is definitely trolling - answer them seriously and see if they are actually engaging in discussion or just keeping on their own path (like a certain poster elsewhere in the forum lately). I took them to be genuine but just overdefensive because discussions are likely to end up... well, like this. But yes, did not get the tone off to a great start either. Though I didn't fully absorb their tone the first time I read it either - just looked at what they were actually asking for, which wasn't even 'equal billing' with the male and female options.)
*** On a tangent about "singular they", I just realised I used it all through that last paragraph without even thinking about it. I think I use it a lot, especially when discussing things online - it's a lot easier than possibly referring to someone by the wrong gender. Though on the receiving end, some people default to using "he" to refer to anyone on a forum, and that always feels strange. Do I hold up the discussion to point out actually I'm a "she", or let it slide? (and I guess for someone who doesn't feel right with either set of pronouns, it must feel like that all the time.)
And I agree it's not worth the work to implement it into this game at this point - particularly relative to things that will benefit the majority of players. It's something that would need to be in there from the ground up.
I do have to wonder how people will handle it in future games with character-creator options though, because even the most idealistic "cater to everyone" aspiration needs to be balanced with how many extra options they can actually provide.
I guess it might depend on where society goes and what becomes the 'expected minimum', and whether people identify in more complex or less complex ways once (or "if", for those who don't see it as inevitable) things become more settled and accepted. Not having to 'make up their own answer' for how to handle pronouns, for example. Singular-they seems to be becoming standardised, in mainstream coverage at least, though I don't know if everyone thinks that's the case or not.