What a jerkASS! His friend said he treats people as people regardless of skin color. JerkASS DUmmie couldn't let that stand and had to ultra-literalize his - hopefully now former - friend's metaphor.
Not that it actually happened, or at the very least, happened in this way, but DUmpass is being obtuse. He knows exactly what his friend meant, and it is a short way of stating the obvious... I suppose one could stretch it out and say "skin pigment and race are not factors I consider as reasons to treat another person badly".
But DUmpasses just can't seem to pass on any opportunity to flex their self-perceived superiority that ironically, is quite racist in nature itself. This DUmpass very clearly meant to bash on his buddy for being white and not "taking a knee" metaphorically.
Only a true nimrod believes that skin pigment affects human behaviors. I will, however, insist that all cultures are not equal, and some deserve the criticism that they attract... be in the meth head white trash criminals in a remote shack in the hills of the Blue Ridge, or the thug criminal gang element in inner city Chicago, both are a blight on society and need to be dealt with. DUmpasses are afraid to say it, as doing so is outrageously "racist" according to their rambling and dynamic political rules, but only if the person being judged is a particular color (that can change by the minute should they so desire).