Pretty obvious what Ray Fisher's motives were
He got more screen time in this version. A lot more. His character got chopped on the editing room floor in the theatrical version, he got mad about it, and started throwing out accusations; which he still to this day has not substantiated.
This is the world we live in now. It's widely acceptable that you may throw out accusations when you don't like something - and he knows this - so he started talking shit when he saw his character got less screen time than he wanted.