On the face of it I would absolutely disagree with Wilde on that: to live a moral life one absolutely needs to distinguish between good and bad.
But is it necessary to divide people into good and bad? What if you were only to apply goodness and badness to consequences and to your own actions?
If your own action is to empower another person, understanding that person's goodness or badness is necessary to understanding the action's goodness or badness.
Here's the new thread for posting quotes, with the usual rules: