You do understand the purpose of pronouns, yes?Reasonableness is not the issue.
If I am unsure of your gender, I might wonder:
Why did libra consider my response to be unreasonable?
but never
Why did they consider my response to be unreasonable?
if only because, in my mind, "they" asserts plurality and people are more than gender. For what little it's worth, while I don't view this as a right/wrong issue, I would have preferred neologisms in the vein of "Latinx."
If I was unsure of your gender, the compound sentence below, what is preferable?
Jayhawker Soule facepalmed in response to said post, because Jayhawker Soule thought any other response by Jayhawker Soule would not convey Jayhawker Soule's preference of neologisms in the vein of "Latinx."
...or...Jayhawker Soule facepalmed in response to said post, because they thought any other response by them would not convey their preference of neologisms in the vein of "Latinx."