Actually it is true that robots can be racist and replicate human biases. I work with this kind of stuff daily.

The sinister part is not that "robots cant be racist" but that robots can be racist and they are against white people and men, because they replicate the human biases. The sinister part is that because of their human biases, that the robots are already replicating, they want to "correct" the machines/robots to replicate human biases even more.