Joseph- DY’s point is correct; they don’t have so much to complain about, since their shidduchim go relatively smoothly. They don’t have to go through what we have to go through in order to get dates.
Obviously, there are other frustrations involved for boys, and some of the blame does go the other way. But since girls are in the position of weakness in this equation, it makes sense that a lot more blame is vented at the boys (and specifically their mothers, since they are the ones who take care of their sons’ shidduchim).