Even after Saul had lost the throne to David because of his insincere repentance in front of Samuel, David refused to touch Saul because of the anointing that God had put on Saul by the hand of Samuel.
So, though there may be a prophet or evangelist who long ago lost his "throne", it would be unwise for any of us to attack that person.
For me personally, I only attack when I feel led to do so, or if the teachings are clearly and blatantly against God (e.g., Bill Johnson, Todd Bentley, Rick Warren, Kim Clement, etc.)
I do believe that our Father has called each of us in very clear ways. Obedience is so powerful, we should walk as we are told. If called to the ministry of small favors, do it. If called to renounce false prophets, do that, too. Even if the person is/was anointed, do what God says to do. That is simple. The message of obedience is powerful and constant all through scripture.
All true prophets/servants of God direct everyone to the Father, not to themselves. If you already know Jesus personally, there is no need to suck milk from the menagerie of prophets walking around. Always follow God, not men.