He is referring to professional Democrats, not your typical Democrat voter. To continue:
The fact that one of their more politically useful falsehoods nowadays is telling black people that their problems are caused by white racism should not require us to treat that lie any more seriously than we do any other Democrat lie.
When Democrats say we need “a conversation on race,” what they really mean is they want to have a monologue, a tedious lecture about all the evils perpetrated against black people by those evil racist Republicans. Your part of the “conversation” is, shut up.