Jesus forbade the calling of people "fool(s)" on pain of going to hell, yet he himself called people fools not once but twice. Take a look at the bible passages below:
21 "You have heard that it was said to the people long ago, 'Do not murder, and anyone who murders will be subject to judgment.'
22 But I tell you that anyone who is angry with his brother will be subject to judgment. Again, anyone who says to his brother, 'Raca,' is answerable to the Sanhedrin. But anyone who says, 'You fool!' will be in danger of the fire of hell.
39 And the Lord said unto him, Now do ye Pharisees make clean the outside of the cup and the platter; but your inward part is full of ravening and wickedness.
40 Ye fools, did not he that made that which is without make that which is within also?
23 And when they found not his body, they came, saying, that they had also seen a vision of angels, which said that he was alive.
24 And certain of them which were with us went to the sepulchre, and found it even so as the women had said: but him they saw not.
25 Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken:
26 Ought not Christ to have suffered these things, and to enter into his glory?
27 And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself.
This Jesus fellow was quite an ignoramus and hypocritical imposter, who ironically characterised others as hypocrite without first examining himself. Why did he not take his own advice and remove the plank from his eyes before point fingers at others.
Some importance references:
Sins of Jesus