He didn’t know why he stabbed her to death but he mentioned his target’s race. Hmmm.
What I think he meant by white is that white is an appropriate target for robbery, a white woman will have a nice car and he deserves a nice car more than she does.
I’ll even go out on a limb and guess it wasn’t premeditated murder against a white - he just snapped when she resisted and doesn’t know why now - the stupid thug.