If I recall correctly, it's LeShawn who makes the statement "husbands just never seem to want to dance with their wives, why is that?" directed at Lureen, and then Lureen taps Jack on the shoulder and says something like "I don't know. Jack, why do you think that is?" and Jack says "I never gave it much thought". I think the "husbands never want to dance with their wives" statement, which is agreed upon by both wives at the table, is a metaphor for something other than dancing; i.e., have sex with. These two women are married to two gay men, but nobody at the table is willing to admit anything to anybody else at the table. When LeShawn said that Randall was an animal husbandry major (which I believe is the study of animals having sex, correct me if I'm wrong), he stared directly at Jack, and they held the gaze for more than a second. I think Jack was already starting to take some interest in Randall, and I think he asked his wife to dance, in part, to see how Randall would react; i.e., jealousy, anger, refusal, or 'take her, she's yours' attitude. Obviously, he got the latter.
I think Lureen was a girl who had a fling, got knocked up, had to get married, and was resentful ever since. It just grew and grew over the years as she realized that the man she married wasn't who she thought he was at all. I'm guessing this particular night wasn't the first "vocal show of apathy", as forsythia12 put it. It's just the first one we got to see. It takes time and practice to get that good at making your spouse feel like dirt. And both of them were doing a pretty good job of it that night.
The part that interests me the most about the whole social dance night is when Jack and Randall are sitting outside on the bench, and Jack brings up the question of "why do women powder their noses right before they're going to go home and go to bed?", and neither of them know that the answer is that most women, after a night out on the town with their husbands, expect that he's going to make a romantic move when they get home, and they want to look nice for it. It didn't even occur to these two men to think about making romantic moves on their wives when they get home; therefore, they couldn't understand. Another part that kills me is when Randall proposes that they go down to his boss's cabin some weekend, get away, relax, drink some whiskey, do a little fishing, etc. All exact memories of his times with Ennis. Jack stares straight ahead, without blinking, as the words are coming out of Randall's mouth, and it's almost as if Jack wishes he could turn back time, and pretend that was Ennis, again, sitting right next to him, making those same proposals. I think, more than anything, that is the reason why he ended up having the affair with Randall. He got to do the same types of things, except with a replacement man who seemed a WHOLE lot more willing to commit, and a whole lot less trouble.
Just my thoughts.
