Yes, correct, well done.
However, in South Africa, 99% of racism is White people disliking Black people, regardless of their origin. Instances like this of Black South Africans abusing other Black people are incredibly rare by comparison.
Hahahahahahaha. No. There are whites who don't like blacks, blacks who don't like blacks, South Africans who don't like Zimbabweans etc etc. You're completely and utterly deluded if you think racism in SA is only perpetuated by white people.