@Ian R McNee Zille's tweets are demonstrably racist. Where a "racist" is defined as someone who believes (1) That "race" exists as a "scientific concept"not a "social construct " referring to language , culture & superficial appearances. and (2) That some "races"  are  superior to others? So does Zille qualify as a "racist" according to these criteria?Let us try a "litmus test".In Matric in a Catholic School in 1970 a German nun who was teaching us "History " once said."Your ancestors were cannibals! They were Savages! They would have wiped each other out if White missionaries had not arrived in the nick  of time. I pointed out that they would not have "wiped each other out" as "the last one would have committed suicide", much to her disgust and to the amusement of my (black of course this was under apartheid) classmates.(but I digress) 

Sounds familiar does it not? Zille would merely have added "and the colonialists brought piped water, .......and of course the internet".