The title of chapter 13 of Born a Crime—"Colorblind"—is significant because it deals with Trevor's family moving into Highlands North, a white neighborhood. They are only able to do this because one of the white families in the neighborhood is prepared to sell their house to a mixed-race family. Or, to use Trevor's more colorful language, his mother buys a house from the one family in Highlands North that "doesn't give a f***."
In selling their house to Trevor's family, the white family concerned is showing that they're colorblind to a certain extent, a very rare quality in South Africa during the apartheid years. What makes colorblindness more likely in this part of the world is that Highlands North has a large Jewish population. And as Trevor reflects, these are people who are not about to up sticks and leave just because a colored family has moved into the neighborhood. They've already done their fleeing, as he puts it, and so are not going to flee any more.
At the same time, there are limits to colorblindness even in Highlands North. People live behind large walls that separate themselves from each other. As Trevor discovers, this is hardly conducive to inter-racial harmony. As the only black kid in the neighborhood he finds it difficult to make friends.