Who/what stomped John, what happened to make him who he is at the film? Were John’s bull-riding glory days before Jack was born? If so, how did Jack find out that his father was well-known? What happened to the money he earned--how did the Twist family wind up on a lonesome old ranch?
My own theory is that Jack's father wasn't as successful in rodeo as Jack "remembers" him being, which isn't unusual. People often form childhood impressions of parents that they carry into adulthood. He might have been a very disappointed man, and might have actually hoped that Jack
wouldn't try to follow in his father's footsteps. And there was some kind of issue about Jack's marriage implied in the line "thought he was
too damn special to be bured in the family plot." IMO, there was a lot tangled family relationships implied in that scene, with very brief dialogue.