Giving sight to a man, who had been born blind, was no ordinary event.  Yet the religious leaders refused to accept that Jesus' miracles were a sign of the presence of God.  They hated Jesus because He exposed them as shallow, money-grabbing, power-hungry and self-glorifying (Luke 16:14-15).  So, the Pharisees twice interrogated the healed man and questioned his parents, trying to find any reason to discredit Jesus.  Eventually, after they had asked many questions, the man provocatively asked if they also wanted to be disciples of Jesus (John 9:27).
 
They were furious and threw off their official dignity.  Hurling insults at the man, they accused him of theological ignorance.  But his reply was wise: he considered his healing was from God with whom Jesus must have been in a very good relationship.  If Jesus was not from God, He could do nothing.  It was obvious to the man that Jesus had God's authority, because the healing was so remarkable.  Those comments made the Pharisees even angrier, and they banned him from worshipping in the synagogue.

The man’s final argument, “If this man (Jesus) were not from God, He could do nothing” caused them to erupt in anger because the truth about Jesus will always hurt when people do not want to submit to His authority (Luke 19:14).
 
Their behaviour is typical of arrogant bullies who are  out of their depth.  Insults are easy ammunition when true arguments cannot be found.  Although they claimed to speak the truth about God, their real intention was to preserve their own religious authority over the people.  Despite all the evidence, they were blind to the truth about Jesus.  Such people exist everywhere today.  While they are in control, they seem reasonable and even wise; but when they realise that Jesus is really the Master of everything - they throw their hatred at anyone who is unashamed of belonging to Him.  Endure that hardship; it is not a sign that God has abandoned you (2 Timothy 2:3; Hebrews 12:7).  No! Instead, it shows that you truly are part of His kingdom.  So do not be intimidated by those who are blind to the obvious; just make sure you keep Jesus in sight and follow Him (Acts 4:8-13).