Carter, as do many black men and women, recognizes racism when it appears in any form. It does not matter how well it is camouflaged; blacks who have been victims of racism can sense when it appears. They don't necessarily overtly respond to it, but they can sense it.
Carter lived in Georgia, where a restaurant owner once passed out pick handles to white customers to keep blacks from entering. He knows about Alabama, Arkansas and Mississippi governors' efforts to prevent the integration of schools in their states, plus other horrible things that occurred in these Unites States. He knows that denial does not erase the true feelings of those who hate.
Carter tried to change the image of the United States while he was president. He has worked to improve living conditions of U.S. residents since his presidency. He is authentic and needs to be heard and respected.