A majority of the income disparity is due to choice of field to work in - a personal choice. Primary education pays less than software development. The first is staffed primarily by women, the second men.

There are no laws or practices in place that make these choices mandatory, and men who enter education face as many cultural hurdles as women who enter tech - for the same reasons: their gender.

That said, even within an industry there is still a disparity, between 3-10%. This still needs to be fixed.

Should individuals be punished for income disparity that is a larger function of society?

Imagine this in the context of a business relationship. You put $200k into the business every year, your (female) partner puts in $60k. If for some reason after 10 years the business goes south, will the fairest way to distribute the resulting assets and liabilities be in a 50:50 ratio because there is an income disparity in the broader society?

[Admittedly my analogy is imperfect, but hopefully there's a point in there.]