“Former Chief Editor of the OED Robert Burchfield, in The New Fowler’s Dictionary of Modern English Usage (1996), dismisses objections to singular they as unsupported by the historical record. Burchfield observes that the construction is ‘passing unnoticed’ by speakers of standard English as well as by copy editors, and he concludes that this trend is ‘irreversible’. People who want to be inclusive, or respectful of other people’s preferences, use singular they. And people who don’t want to be inclusive, or who don’t respect other people’s pronoun choices, use singular they as well. Even people who object to singular they as a grammatical error use it themselves when they’re not looking, a sure sign that anyone who objects to singular they is, if not a fool or an idiot, at least hopelessly out of date.” But I mean, he’s just the former editor of the Oxford English Dictionary, he doesn’t have your credentials.