Going through John 19 I am not seeing the mockery at all
Pilate had a notice prepared and fastened to the cross. It read: jesus of nazareth, the king of the jews. 20 Many of the Jews read this sign, for the place where Jesus was crucified was near the city, and the sign was written in Aramaic, Latin and Greek. 21 The chief priests of the Jews protested to Pilate, “Do not write ‘The King of the Jews,’ but that this man claimed to be king of the Jews.”
22 Pilate answered, “What I have written, I have written.”
There is more than one gospel in the holy scriptures look further afield and see what you can find.
Matthew 27:27-31
27 Then the soldiers of the procurator, taking Jesus up to the praetorium, gathered the entire cohort around him.
28 And stripping him, they put a scarlet cloak around him.
29 And plaiting a crown of thorns, they placed it on his head, with a reed in his right hand. And genuflecting before him, they mocked him, saying, “Hail, King of the Jews.”
30 And spitting on him, they took the reed and struck his head.
31 And after they had mocked him, they stripped him of the cloak, and clothed him with his own garments, and they led him away to crucify him.
Matthew 27:32-44
32 As they went out, they found a man of Cyrene, Simon by name. They compelled this man to carry his cross.
33 And when they came to a place called Golgotha (which means Place of a Skull),
34 they offered him wine to drink, mixed with gall, but when he tasted it, he would not drink it.
35 And when they had crucified him, they divided his garments among them by casting lots.
36 Then they sat down and kept watch over him there.
37 And over his head they put the charge against him, which read, This is Jesus, the King of the Jews.
38 Then two robbers were crucified with him, one on the right and one on the left.
39 And those who passed by derided him, wagging their heads
40 and saying, You who would destroy the temple and rebuild it in three days, save yourself! If you are the Son of God, come down from the cross.
41 So also the chief priests, with the scribes and elders, mocked him, saying,
42 He saved others; he cannot save himself. He is the King of Israel; let him come down now from the cross, and we will believe in him.
43 He trusts in God; let God deliver him now, if he desires him. For he said, I am the Son of God.
44 And the robbers who were crucified with him also reviled him in the same way.