I feel specifically racist against South African people
Why are you racist against South Africans?
I've had bad experiences with people from there and dislike Nelson Mandela
It's wrong to be racist against any group, and you shouldn't say bad things about South African people.  Even if some of them did bad things to you in the past, that has nothing to do with the rest of the population that you are unfairly maligning.
They are the worst and I'm glad that white people helped to end apartheid for all you idiots.
I'm not even from SA. It is good they have taken steps to end racism and try to give all of their citizens a chance to be equal. Judging people based on skin color is wrong you should get to know individuals.