The "untouchable" woman touched the robe of Jesus' garment (Matthew 9:21, Mark 5:28). Did Jesus rebuke her? Many more who were sick sought Him out, including "unclean" lepers, to touch his robe (Matthew 14:36, Mark 3:10, Mack 6:56, Mark 8:22, Luke 6:19). Little children were brought to Him that he might touch them and bless them (Mark 10:13, Luke 18:15) . The disciples tried to turn the children away. Did Jesus approve of the disciple's behavior? Did Jesus first determine people's spiritual state before allowing them to approach?
From the WT website on Shunning
2. How to Treat Expelled Ones: God's Word commands Christians not to keep company or fellowship with a person who has been expelled from the congregation... Jesus was thus instructing his followers not to associate with expelled ones. --See The Watchtower of September 15, 1981, pages 18-20.
3.This means that loyal Christians do not have spiritual fellowship with anyone who has been expelled from the congregation. But more is involved. God's Word states that we should 'not even eat with such a man.' (1 Cor. 5:11) Hence, we also avoid social fellowship with an expelled person. This would rule out joining him in a picnic, party, or trip to the shops or theatre or sitting down to a meal with him either in the home or at a restaurant.
4. What about speaking with a disfellowshipped person? ...The Watchtower of September 15, 1981, page 25, says "A simple 'Hello' to someone can be the first step that develops into a conversation and maybe even a friendship. Would we want to take that first step with a disfellowhipped person?"
5. Indeed, it is just as page 31 of the same issue of The Watchtower states: "The fact is that when a Christian gives himself over to sin and has to be disfellowshipped, he forfeits much: his approved standing with God;....sweet fellowship with the brothers, including much of the association he had with Christian relatives."
Again, did Jesus ever avoid touching the "expelled ones" the Unclean? Was there anybody he refused to touch? After Peter denied him three times, did Jesus refuse fellowship with him? After Jesus' ultimate sacrifice, weren't the old laws of clean and unclean, sin and sacrifice, done away with?