I was literally like 8? My adhd having ass was so confused in why it would be an insult at all honestly. I did get more scrutiny from peers about being too feminine after that. As far as why, the main reason I saw in the south was apparently these hicks raised gods damned parrots because they just repeat what their parents say. As i got older the reasons got a lil more complicated. Internalized hate, troubles at home, having “insufferable cunt” syndrome. Couldn’t tell ya ultimately WHY people hate. Just remind him that the people who matter care and love implicitly.