From Merriam-Webster dictionary as of today:
\ ˈt͟hā \
Definition of they (Entry 1 of 2)
1: those ones : those people, animals, or things
They dance well.
What do they want to do?
They aren’t as popular as they once were.
2—used to refer to people in a general way or to a group of people who are not specified
You know what they say.
People can do what they want.
They say the trial could go on for weeks.
He’s as lazy as they come.
3—used with an indefinite third person singular antecedent
No one has to go if they don’t want to.
Everyone knew where they stood …
— E. L. Doctorow
I’m sure I’ve used this kind of usage many times. On the rare occasions when I notice it could be considered problematic (problematical?), I often switch over to the informal-sounding second person: “You don’t have to go if you don’t want to.” This has the advantage that the word “you” in English is used both for singular and plural and doesn’t come with a presupposed gender. Of course, you end up sounding like Bright Lights, Big City but that’s a price you might want to pay.
4—used to refer to a single person whose gender identity is nonbinary (see NONBINARY sense c)
I knew certain things about … the person I was interviewing.… They had adopted their gender-neutral name a few years ago, when they began to consciously identify as nonbinary — that is, neither male nor female. They were in their late 20s, working as an event planner, applying to graduate school.
— Amy Harmon
When you are looking for clarity of thought, Amy Harmon, the Watsoner of Nonagenarian Great Men of Science, is where you turn first.
Note that this quote is carefully selected and/or edited to avoid any of the obvious grammar conundrums around the new They: e.g., “they had” and “they were,” rather than a present tense formulation that would force the writer to choose between, say, “they has” or “they had” and between “they is” and “they are.”
My impression is that The Woke tend to have the personalities of Grammar Nazis, so how exactly do they square this circle?