Disgusting hygiene? Immaturity? Bad manners? Lacking social skills? No job? No house? Boy, I could do this all day.
I think the big one is feminism — nothing has destroyed femininity [or even the quality of graciousness] quite so well.
The ability to have a baby in her 20s with a guy who might not stay and can’t provide well, because she gets Head Start, WIC, SNAP, subsidized daycare and all the benefits whether he stays or not. In fact, it is a dis-incentive to get married, because then she loses all her benefits.