How is explicit discrimination and racial segregation ”a fight to end discrimination”? All this ”we have long history is america black slavery blaablablah” is

How is explicit discrimination and racial segregation ”a fight to end discrimination”? All this ”we have long history is america black slavery blaablablah” is not any kind of a counter argument. By segregating people you are doing exactly the same thing what slave owners, south africans and those hillbilly right wing extremists do.