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I'm curious on what made it ungrammatical? I'm assuming you mean "they" used to not be singular? That somewhat surprises me, as I've never been distracted by

• ghaff 3y ago
  Yes, there is precedent for singular "they" which is one of the justifications for why it's a convenient hack for generically referring to an individual person. But I can assure you that had I done so in school growing up I would have been corrected and told to use he unless the individual in question was clearly a woman. (Or, presumably, had some female-associated role like a nurse.) And where I work now, it's probably only been in our style guide for five years or so. Prior to that we'd have used some other workaround.