Well, you say that, but it sounded like he was speaking their language pretty well for someone who's supposedly demeaning their culture. Don't think the (f'ing baffling!) impression of Desmond Tutu was any more demeaning to black people than an impression of John Lennon would be to Liverpudlians, either.
I know there is a bit more racial tension in South Africa than round here, though. So I'll say that you might be right and leave it at that.