Simon

“And here’s an example of deliberate violation of a Fake Rule:   Fake Rule: The generic pronoun in English is he. Violation: “Each one in turn reads their piece aloud.”   This is wrong, say the grammar bullies, because each one, each person is a singular noun and their is a plural pronoun. But Shakespeare used their with words such as everybody, anybody, a person, and so we all do when we’re talking. (“It’s enough to drive anyone out of their senses,” said George Bernard Shaw.) The grammarians started telling us it was incorrect along in the sixteenth or seventeenth century. That was when they also declared that the pronoun he includes both sexes, as in “If a person needs an abortion, he should be required to tell his parents.” My use of their is socially motivated and, if you like, politically correct: a deliberate response to the socially and politically significant banning of our genderless pronoun by language legislators enforcing the notion that the male sex is the only one that counts. I consistently break a rule I consider to be not only fake but pernicious. I know what I’m doing and why.”
― Ursula K. Le Guin, Steering The Craft: A Twenty-First-Century Guide to Sailing the Sea of Story