Walmart announcement tells all black shoppers to leave - a horrible sign of intolerance

Racial divisions is something that the US has struggled to overcome for long periods of its history, finally starting to gain equality for all after a series of US Supreme Court judgments in the 1950's and 60's which were implemented by the Federal Government (sometimes over the opposition of various state level governments).
However, the area of racial tolerance and discrimination between people based on their race is something that is just below the surface, and can sometimes come to the forefront fairly quickly (and has the ability to shock people when that happens). Consider this case where shoppers inside a Walmart store heard an announcement for all black shoppers to leave (link to article):

A Walmart store announcement ordering black people to leave brought chagrin and apologies Wednesday from leaders of the company. A male voice came over the public-address system Sunday evening at a store in Washington Township, in southern New Jersey, and announced: "Attention, Walmart customers: All black people, leave the store now."
Shoppers in the store said a manager quickly got on the public-address system and apologized. It was unclear whether a rogue patron or an employee was responsible for the comment, but many customers expressed their anger to store management.

Obviously, this was something that the management of Walmart would never have accepted.

Horrific apartheid-era happening in South Africa

South Africa has been free of racial discrimination / apartheid for many years now, and no longer are there incidents of white vs. black allowed legally. In fact, the country is rules by a party that represented the aspirations of the black people fighting the white government. So it was all the more surprising to read of an incident where white students at a University tricked some black workers into having some meat stew laced with urine, something that sounds positively horrible:

A South African university said Tuesday it will close the dormitory where white students tricked black workers into tasting stew laced with urine, an incident that sparked protests when revealed earlier this year.
The school became the focus of protests in February, after video surfaced of white students at the dormitory urging at least five black housekeepers to eat what appeared to be beef stew in a plastic bowl. Before serving the stew to the housekeepers, the students urinated into the mixture. At the end of the video, recorded in September, a message appears on the screen in Afrikaans saying, "That, at the end of the day, is what we think of integration."

This essentially shows that there are racial feelings still present among people, and it will be a challenge to get rid of them.