Steven Pinker says "they" and "they" are homonyms, so suck it. Plus check out these examples from the wikipedia page, so suck it some more.
- Eche of theym sholde ... make theymselfe redy. — Caxton
- Arise; one knocks. / ... / Hark, how they knock! — Shakespeare, Romeo and Juliet
- 'Tis meet that some more audience than a mother, since nature makes them partial, should o'erhear the speech. — Shakespeare, Hamlet
- I would have everybody marry if they can do it properly. — Austen, Mansfield Park (1814)
- That's always your way, Maim—always sailing in to help somebody before they're hurt. — Mark Twain, Adventures of Huckleberry Finn (1884)
- Caesar: "No, Cleopatra. No man goes to battle to be killed." / Cleopatra: "But they do get killed". — Shaw, Caesar and Cleopatra (1901)
