"I sometimes visualize the ongoing cycle of racism as a moving walkway at the airport. Active racist behavior is equivalent to walking fast on the conveyor belt. The person engaged in active racist behavior has identified with the ideology of White supremacy and is moving with it. Passive racist behavior is equivalent to standing still on the walkway. No overt effort is being made, but the conveyor belt moves the bystanders along to the same destination as those who are actively walking. Some of the bystanders may feel the motion of the conveyor belt, see the active racists ahead of them, and choose to turn around, unwilling to go the same destination as the White supremacists. But unless they are walking actively in the opposite direction at a speed faster than the conveyor belt—unless they are actively antiracist—they will find themselves carried along with the others."
Beverly Daniels Tatum: Defining Racism: Can We Talk?