The conversation between Trevor's mother and the minibus driver showed how the enmity between the Zulu and Xhosa tribes was violent and full of cruel stereotypes.
We can answer this answer because:
Trevor's mother was from the Xhosa tribe, while the minibus driver was from the Zulu tribe.
These tribes were enemies and when the driver realized that Trevor's mother was from the Xhosa tribe, he started treating her very badly.
He spoke many curses to Trevor's mother and accused her of being a promiscuous and immoral woman, as this was a stereotype of the women of the Xhosa tribe.
Trevor's mother didn't take the curses and rebutted them with as much dignity as she could, but that wasn't enough to silence the driver.
Trevor claims that the Zulu and Xhosa trios were very different from each other, particularly in terms of their stances against the colonial elite. He claims that the Xhosa were positioning themselves politically and diplomatically, while the Zulu were positioning themselves in a combative and violent way.
This question is related to the book "Born a Crime."
