The AP style book has created an uproar among the people who make a living by putting words on to (onto?) pieces of paper.
The heart of the issue, if you read to the end, is the AP decided to make “they” and “their” acceptable as a singular pronoun because of the lack of a gender neutral pronoun to describe a non-binary person – a human who is neither male nor female.
“Bill, who is non-binary, takes their lunch to work in a brown paper bag”
We do have a pronoun already for that purpose – “it”.