It's called being in an abusive relationship. Being called a nazi or racist or fascist or whatever negative term over and over until the target of abuse will believe they are those things if they go against the abuser who calls the abused one of those things.
The Democratic Party’s evolution from slave codes to bureaucratic codes is not a story of moral repentance, but of adaptation. The control systems changed, but the instinct to control grew ever more clever. It never morally improved. Never once.