Yes, I do know all about the Brits invention of CONCENTRATION CAMPS, which were as brutal as one can imagine.
OTOH, in more modern times, blacks who worked for whites were NOT normally ( I don't know about EVERYBODY, but DO KNOW about many! ) treated quite well.
The Brits didn’t invent concentration camps. That distinction goes to the Spanish in Cuba.
And there was a middle class, but not a substantial one. It grew as the Nationalists slowly yielded to the inevitable and the strictures of Apartheid declined, preparing the way for Mandela’s ascension to power, I believe with his cooperation. But of course his efforts had to fail in the end. Communism is communism. To his credit, he didn’t commit any massacres of whites or dissident blacks. Now that he’s long gone, it’s started. Again: Relatively reasonable.