We must have the courage to take a stand and become intolerant more often. But being intolerant means we must act, we must actually take and defend a position. As a leader this may mean upholding an unpopular decision. Opposing discrimination is not a difficult decision to defend, but there will be more subtle issues that still require you to take a stand in which indifference may seem to be preferable.
THIS is the point at which authentic leadership rises to the top.
Where do you need to stop being indifferent and instead become intolerant?
When you can act on principle instead of expediency, you will know that have reached that goal.