Though I have not explored this issue beyond my own personal experience I have some inclination to agree. As someone who faced divorce at one time with two small children I am very familiar with the court's bias against a father's custody of the children. Regardless of how much evidence I produced to suggest the mother should not have custody it was all ignored by the court. It is a precedent that hails back to the days of Lord Byron in England. Although I finally got custody of my children, it wasn't a matter of who would make the better parent. I just bought the mother off. Great justice right?
This is why I'm a masculinist. As far as I know, I'm the only woman on this forum who makes that claim.