Everyone knows this statistic has been discredited very thoroughly. All things being equal (experience, training, position, etc.) the pay gap between a man and women drops to zero.

The "pay gap" talking point is part of a broader socialist political ideology that seeks to destroy conservative families and create such a work force that all men and women work full-time outside the home so they *all* pay taxes, and so they must outsource parenting and household work to third parties, who are themselves also taxpayers. The tax man *hates* a family headed by one good income, with a homemaker spouse who pays no income tax but who has  equal de facto control over the money, keeps up the home, raises the children and manages the family finances. 

That's what this is about. It is about destroying traditional family structures and turning *everything* into taxable income work, increasing the government's size, power, and intrusion into people's lives.