If it is frightening to Dr. Carson that I want equality, then he is being irrational. If he views my desire to be equal as divisive and merely an aspect of "PC culture," that makes little sense. If he believes that wanting to be treated equally under the law is provoking some sort of war, making enemies and destroying this nation, then he is not thinking clearly.
I can see Biden's point about solving the nation's problems: If you're working toward solutions, why call an advocate of a policy you oppose your "enemy," when "my good friend across the aisle" will do? My reservation is that speaking well of the other party can drain genuinely moral disputes of authentic moral authority.
Enemies, depending on the degree to which you empower them, can rule -- and ruin -- your life. They make your kid not want to play on the soccer team anymore. They make your mother want to skip the dining room and eat in her room at the assisted living place. They make you dread going to office meetings where they seem intent on undermining everything you say.