I fail to see how Margolyes' language in the live broadcast exhibited racial prejudice towards Andrew Peters. Tactless to make personal remarks in the situation, yes, but remarking that black people have a variety of shades of skin is simply a factual observation. I have many friends - also family - who are black, and the subject occurs in conversation with regularity; predominantly in assessing from what region of Africa a particular person is likely to originate. Conversations not restricted to within black circles, I might add. The subject is very interesting.
That said, Margolyes' use of the colonial-era term "high yellow" was crass, as were her later comments attempting to extenuate the original perceived offence. She is an insensitive bighead (and crashing bore), at worst, and it was this and this alone that was the cause of any unease experienced by Andrew Peters.