Josh's race obsession is very bizarre and I think it goes beyond the sort of normal edginess of web 1.0.
Josh is just an actual legit racist
Let me simplify Josh's hatred for you: I bet my bottom dollar before kiwi farms was ever a thing... What we're going to do right now is go back, WAY BACK.
I bet he mouthed off to the wrong brother one day and in the words of Negan he got the holy fuck mother fuck fuckety fuck fuck beat out of him by a fist that had ashy knuckles.