I watched the episode and thought it was a load of fuss over nothing, however giving it further thought I can see it probably was.....
Reason? If playing a white man was being reasonable and honest it implies black people aren't I suppose, which is obviously nonsense.
In the 1980's one of the most popular TV shows on prime television was "Love thy neighbour" where Jack Smethurst used to refer to the guy next door as "That black nig nog" and it was considered funny...He in turn used to say "That white honkey"......There were very few complaints...
[youtube]http://www.youtube.com/watch?v=c_gN7zlpnz8[/youtube]
Different times......