Tests like this must be jarring to the subjects.
To see on a computer read out that you have biases that you don't even think about either going to have you thinking the test is 'wrong' or reevaluating everything.
Like, I am assuming some of those women aren't trying to practice racism (could be naive with that) in their every day life, but clearly they have a bias ingrained in them...Lets pretend some of those ladies of either color didn't like what they saw, and decided they wanted to change that.....how would they even go about that?
Human conditioning is a powerful drug.