Valid point.
See the Afrikaner has also aimed his ire at the South African government on their land reform policy.
Apartheid South Africa and Nazi Germany were also directly inspired by america who was the global leader in race law, including its segregation policies; anti-miscegenation law (no race mixing/interracial marriage illegal) for one. So there is a lot of kinship between them. Musk is home away from home.
In terms of boycotting, I suppose it depends in how far this regime takes it. Was america boycotted in the 1960s? When Harry Truman was asked in 1963 about the prospect of interracial marraige becoming legal in america he said: "I hope not; I don’t believe in it. Would you want your daughter to marry a Negro? She won't love someone who isn't her color." It also had a white only immigration policy (Hitler admiringly wrote in Mein kampf: "The American Union categorically refuses the immigration of physically unhealthy elements, and simply excludes the immigration of certain races").
Pior to the 1965 act (linked), america was 85% White, with Black people (descendants of slaves) making up 11%, while Latinos made up less than 4%.
https://en.wikipedia.org/wiki/Immigration_and_Nationality_Act_of_1965
america's first naturalization law (1790 naturalization act) restricted naturalized citizenship to "white persons". A man from India in a 1920s legal case was denied american citizenship as he was not deemed white. (NY Times link).
https://www.nytimes.com/1923/02/20/archives/court-rules-hindu-not-a-white-person-bars-high-caste-native-of.html
True americans are white people. That's its foundation as a white setter entity. A land taken by whites (from the natives), for whites. The Africans who were brought over in shackles were only there to work the land taken from the Natives to provide wealth for the white elite, the planter class, jefferson, washington etc.
Non whites were either "savages" (Natives as they are labelled by the racist tyrant jefferson in the 'declaration'), "property" (as African slaves are designated in the articles of confederation), or generally "aliens" (all non whites, none of whom could be citizens).
So with all this in mind, was there a backlash against america's racist policies in the 1960s in the same way there was against Apartheid South Africa?
The Beatles travelled there and there was no backlash (as opposed to Queen who faced a backlash for playing Sun City, South Africa in 1984). The Beatles did refuse to play in front of segregated audiences in Florida, Los Angeles etc. but they still did travel there.
Is there one rule for one and one for another?