He was preprogrammed from birth to see that and only that. If the entire waiting room was full of people with active love in their hearts (probably it was full of people who could not care less about skin color) and Martin Luther King t-shirts under their outerwear he would still only see stink-eye.
I've spent more time in doctors' waiting rooms than has been conducive to enjoyment, and common ordinary behavior is that when some one enters or leaves or moves about a few people look up for a second or two and then look down. Innocuous human curiosity, with no meaning beyond that, but to someone taught to be suspicious and read deep meaning into things lacking deep meaning, being "eye ****ed" would be perceived.
As for the lynching, sterilizing, and syphilis "experiments", heaven05 should inquire what the party politics were of the perpetrators. BTW, finding those perpetrators should not be too difficult. They're in graveyards, as are most of their children and many of their grandchildren.