How you make the leap from "they absolutely want to exterminate your kind" (the 'kind' being those who are pro-Confederacy) to 'this is white people being replaced' is amazing.
Nothing in Elons' response implies that he sympathizes with the Confederate-loving moron he's replying to. He's merely making the point that 'they' (whoever 'they' are) want to see an end to the kind of people who worship slave owners.
This doublethink is astonishing. Please, seriously reconsider your own prejudice when making such preposterous leaps.