Yeah, I personally examined my brain, found the switch labeled "Racial Prejudice" and the other switch labeled "Gender-based Prejudice" and flipped both to 'no', so now I'm completely race and gender blind.

It's a good thing the human brain is a perfect machine with clearly labeled settings, or else my claim of being race/gender blind might really be blinding me to my own biases. Nope! Now that's I've declared myself blind to racial and gender differences, I have no further need to examine my opinions or stay constantly vigilant for the possibility that I am still unconsciously guided by built-in societal biases.

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Less sarcastically and more straightforwardly: People who say they don't 'see' race or gender may be actively and reflexively checking their opinions on people to account for such biases, but often you'll see that exactly the opposite is true: A person who announces their blindness, having decided they are neither racist nor sexist, takes offense if it is ever suggested that they could do anything racist or sexist even by accident.