I honestly do not know why I am talking about this a whole 2 years(Or more) since this pointless argument, in this specific place, sparked.
I believe the first person to point out about using "they" in singular as being odd. is specifically referencing the fact that some languages cannot use "they" for singular. Mostly because in them, "they" is actually divided into male and female pronoums, not having an, arguably, gender neutral state.
The main example that comes to mind(mostly because im more familiar with it), is Portuguese, both brazilian and of Portugal.
In it, "they" doesnt exist by itself, being equivalent to "eles(male)/elas(female)".
(And in portuguese, ALL words have to be defined by male and female states. Pretty sure there is not a single way to express gender neutrality using the grammar itself)
I have seen many brazilians expressing confusion over, how in english, "they" can be used in singular. So I can understand why the first person showed a bad reaction to it (Boy I sure hope this is the reason. I do want to believe that they were not subtly demonstrating distaste over gender neutral pronoums)
Anyhow. I do believe "they" should be used here, it is the current trend, language has never been set in stone, and will never be.
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KRIS DELTARUNE?!?!