Please tell me what "If I wanted to build a new car factory, I literally couldn't paint the cars." has to do with white supremacy?
Maybe the regulations for new car factories are good, maybe they are bad, maybe Musk was exaggerating or making things up whole cloth, but the veracity of these things is mostly unrelated to Musk's views on race.
I’m sure David Duke has said some interesting and intelligent things in his life, too. But once you’ve done enough shitty things, the taint of your shittiness eclipses the value of your ideas.
Which is to say: I’m not going to quote David Duke at someone if I’m engaged in intelligent discussion, even if he happens to have the perfect quote. Unless I want people to think I share his values.