Singular they is not a new concept designed to appeal to the “woke crowd”. I was very much taught in school to use singular they, it was always something used when the gender of the subject was unknown and often even if it is known but unimportant. It has been part of the English language for a long time.
It somewhat invalidates non-binary people by not including them. Grammatically it isn’t necessary (and as an aside is unnecessarily clunky, 6 chrs vs 4) so by using it instead of singular they, it can be seen as exclusionary.
If you hear Latin, you're in trouble. angielski