Why do men think it's cool to hate their wives?

My husband says the guys at his work constantly complain about their wives.  That they have to beg them to go hunting or fishing all weekend.  That they've gained weight.  That they never want to have sex, etc.  My husband says he feels like the odd man out because he never chimes in and when they ask him about it he says he has no real complaints.  He said these men are not exactly underwear models and all have beer bellies. He said they brag that they don't change diapers or clean the house. And that they want to go hunting and fishing every single weekend, leaving the wife at home with the kids.  My female married friends will gripe every now and then that their husband snores, but for the most part we don't complain nonstop about our husbands.