My boomer parents will die on the hill that it sounds “wrong” to use “they” to refer to a singular entity. And whenever they bring that up, I always remind them that the word “they” has been used in that way for AGES.
Example: “Whose umbrella is this? Did they already leave?”
It doesn’t seem to make a difference.
It was beaten into me in school that this is incorrect. “They” is to be used as a plural pronoun only. It’s commonly used in the singular, but it’s wrong according to the English teachers I had. In referring to a person, you must choose either he or she under those grammar rules.
With that said, maybe it’s time for me to move into the future and accept that the meaning of the word has changed. I am confident those English teachers weren’t concerned about actual gender issues. Now, I think those issues are more important than the technical grammatical issues of English.
I’ve offended people in a social setting by insisting that this is the correct usage, when truly it was just me being autistic and informal rather than political.
Perhaps it was the English teachers who were wrong.
Correct or not, people have been using it like that for a while.
When my brain interpreted ‘they’ singular to refer to a unspecified so-far unnamed person or an already mentioned group, it was definitely confusing to have it suddenly used to refer to someone who had just been referred to by name. This was definitely a novel use of ‘they’ for me at the time and I don’t understand why no-one else ever seems to have this kind of confusion. I did get used to it but I don’t think it’s as universal as some of y’all realise.
Edit: I just learnt the term ‘indeterminate antecedent’ from the Wikipedia article someone else linked. Thanks to them, I just got a little bit smarter. ;-)