Yes, the Zulu Kingdom, under King Dingane, betrayed the Boer settlers in 1838 by massacring Piet Retief and his delegation after luring them into Zulu lands and then attacking Boer camps in order to genocide them. This act of betrayal ignited a war known as the Battle of Blood River, where the Boers, using a fortified wagon laager(a fort created with wagons), successfully defended themselves against Zulu attacks, leading to a significant turning point in the conflict for land and control. That the Boers weren't violent colonizers. These Africans literally wanted to genocide white people just for existing in Africa. Now when the British came along, they learned about this. So that might explain why the British were the way they were in South Africa.