What’s fun about grammar is how it evolves over time. In this case, singular “they” used as a replacement for gender-specific pronouns which I intentionally opted not to use and the use of which is accepted by the AP Style Book and acknowledged by Merriam Webster and the American Dialect Society.
The AP Style Book also says you can start sentences with conjunctions like and, but, or so. That doesn’t make it correct.
See Confucius on the rectification of names and Orwell on newspeak. Grammar may change over time but words have meanings. I’m not going to use poor English just to appease someone’s feelings of needing attention. If someone’s not satisfied with “he” or “she”, I’m perfectly willing to use “it”.
Why let the language totalitarians bully you?