Are you sure you're not being sexist, though? Are you comparing them with what you think a real man should be? Btw, It's a rhetorical question out of curiosity, not an accusation. Think about why you feel that way.

There are some families that realize that the wife's job pays more, so the dad stays home. Or, in this economic climate, the dad loses his job and is forced into that position. Some of them say that other men look down upon them as lazy. "what, you married a woman smarter than you, you ain't man enough to make the money," etc.

Some have expressed enlightenment at how much harder it is than they thought it would be, and some were never expected to clean anything other than their rooms growing up and are struggling with this unknown territory. Societal change takes longer than 2 generations.

It could be as you say, and the ones you know just haven't been trained properly.