It’s not the idea of a feast we reject; it’s the Host. But the Host is also the fare. When He says, “Eat my flesh and drink my blood,” we lose our appetite. Still, the idea of a feast, we love. Adam had no problem with the garden. He just wanted to be God too. Fallen man would rather be miserable in sin, than joyful in God.
This parable makes you see the folly of sin, and specifically the sin of unbelief in the gospel. To reject the gospel of the kingdom is to reject an eternal royal wedding feast. “How can they reject the feast?” we cry. But we are them. When you know the human condition you are not puzzled that many refuse, nor by the intensity of the refusal. You are flabbergasted that any come at all.
Here is a parable chock-full of human response—some are apathetic, others persecute, one presumes, and the unexpected feast—and Jesus explains it all by saying many are called but few are chosen. Jesus explains human responses by divine election.
Election does not keep people out of the feast who want in, it brings people in to the feast who would never come.