I don't know why but I always seem to be the only one sticking up for the Aguirres and John Twists of the world.
Partriot1, your points are well taken and I can certainly understand from Jack's father point of view. We don't know completely what goes on in the Twist family. What you have described is exactly the expectation - either individual, family or society on Jack or any of us which one must meet. John is definitely bitter but there is one passage in the short story which makes me chilled in the spine.
"Jack was dick-clipped and the old man was not: it bothered the son who had discovered the anatomical disconformity during a hard scene. He had been about three or four, he said, always late getting to the toilet, struggling with buttons, the seat, the height of the thing and often as not left the surroundings sprinkled down. The old man blew up about it and this one time worked into a crazy rage. "Christ, he licked the stuffin out a me, knocked me down on the bathroom floor, whipped me with his belt. I thought he was killin me. Then he says, "You want a know what it's like with piss all over the place? I'll learn you, and he pulls it out and lets go all over me, soaked me, then he throws a towel at me and makes me mop up the floor, take my clothes off and warsh them in the bathtub, warsh out the towel, I'm bawlin and blubberin. But while he was hosin me down I seen he had some extra materal that I was missing. I seen they'd cut me different like you'd crop a ear or scorch a brand. No way to get it right with him after that"
This is only one of the instances. I am not sure how Jack would have wanted to filfulled his father's dream. If I were Jack, I would want to escape this. John may be simple, honest and hard working man - but not a loving father.
For those interesting in continuing the discussion about Jack's father, I recommend you to check out these two topics
The Importance of Jack's DadJack's Dad