His whole demeanour with respect to this poor sod who has had his whole life ruined even though no one directly involved ever confirmed they heard him say anything racist is terrible. If anything he is actually becoming more aggressive in his stance and trying to claim some kind of moral superiority.

I think every time he posts anything about anybody doing anything at all everyone should reply with “Was he/she/they being racist?”

Until he apologises or shows some kind of appreciation that in this case he may have been wrong, he deserves it.