Apparently the dispute has to do with the mismanagement of a charity (ahem) called "Justice/Together. Deray McSomething, a guy whose weird face I see on Twitter but have no idea who he is, is demanding answers of Shaun King as to why this charity (ahem) is now shuttering.
Milo Yiannopolous links their Twitter feud, which joins together the rawness of Bumfights with the class and erudition of Bumfights.