Even my super chud 6th grade English teacher was always mentioning that 'Shakesphere used they with singular antecedents' and he was apparently the father of modern English in her eyes, so the conversation ended, there was no debate.
I mean, it's a convenient pronoun, when you don't wanna repeat "he or she/his or his" all over again
In my experience the "singular they is grammatically incorrect" mistake is often from people who learned english as a second language, like myself. A significant part of this is because most ESL teachers are frankly not good at teaching
hate to pop the bubble but
spoiler
wasn't this photoshopped?
Chuds when it finally clicks that they too have had pronouns all along
CW: suicide
Chud who picks none/use name because he thought the other chuds genuinely hate pronouns and he remembers the parts of speech from school.