The Jews objected to Jesus proclaimed connectedness to God. John 6:41-42. As far as they were concerned this Jesus was just a biological or marital product of family and nothing more. So Jesus claiming He was greater than Moses must have sounded like a mad man to their limited world view.
Without the bread from heaven the Jews that were delivered out of Egypt would have perished. God proceeds to provide manna from heaven just as he provided a ram in the thicket for Abraham. Gen 22:1-19.
History is repeating itself and here stands Jesus smack bang in the middle of it all. God has actually come into their midst, up close and personal, clothed in human flesh, speaking the truth and they don’t see or hear the connection. Isaiah 53: 1-3. Blindsided by their own insight (or lack of it) & consensus they begin to divide and assume Jesus is into cannibalism or something like that. John 6:51.
The Jews understood the Passover symbolised in a meal but the institution of the Lord’s Supper which would supersede it was yet to take its place in God’s grand plan of redemption for a corrupted world helpless in its sin. The atonement in OT times was about to be fulfilled in the person of God. He was going to shed his blood and take away the sins of the world. John 1:29-34.
On the cross was a type of double play that goes back to the days of Esther. Haman is plotting to get rid of the Jews and all his scheming backfires and so it was with the Jews who were plotting to get rid of Jesus. The magnitude of the cross and its complexity, simplicity and sublime victory is of the highest order that should find us amazed at such a graceful and selfless act that still speaks to the history and orders of the world today which wander this way and that.