I think OMT was a stubborn man with a limited horizon who believed that everybody was like him;even his son's wishes of going out from his town's few opportunities was a motif of depiction for him.Because he never had appreciate him,never had treated him like he deserved...Everything that was in rapport with Jack was object of his jokes,when not depiction or even hate;his work,his rodeo skills,his marriage,his own son,and of course,his friends.I think he knew or at least,guessed what kind of relationship there was between Jack and Ennis,but this was only a main reason to depict it and forget it;what's more,I think that this was as a reaffirmation of his untrust about Jack,a real knowledge that he wasn't and never would be as he really wanted his son was.For this reason,this always wanted above all to have people's approval,and also Ennis's when they met;I think he had spent half his life trying to show Ennis that he was worth of sharing his life with and,somehow,took his friend's denials as a demeanour in his own value and self esteem.