[quote=@whizzball1]
<Snipped quote by Extra>

I'm sorry if I'm annoying you, but at this point I'm genuinely curious as to which one of us is right, and I'm determined to follow this discussion to the end. The method I most like of disproving something is by disproving every argument that it is true, and therefore if I happen upon an argument that a traditionally masculine pronoun has been used as a gender-neutral singular pronoun prior to Chaucer's use of a plural pronoun as a gender-neutral singular pronoun that I cannot disprove, I will rethink my position. (Still never going to stop using "they" and "their" for that, though, because me likes it.)
[/quote]

I still wish we had a Foundation of Grammar that defines what is correct and incorrect in English. I don't like fluidity.