If you can cite examples of white people calling other white people "white arsehole" then i'll agree.

However, I don't believe Steve Williams would have called his current employer a "white arsehole" (had they fallen out), he'd have just said "arsehole," so the "black" bit seems pretty unnecessary to me unless there's some other meaning... Apart from him stating a FACT, of course, because the whole world needed telling Tiger Woods is black (well asian/black (is that racist?).. shit