"As for "disadvantage", well hey, I've been discriminated against as a woman, as were many of my contemporaries."
Everybody is discriminated all the time by everybody. Tall people make more than short, they (we) also gett elected to political office more often than short people.
Fat people don't have a chance. Go sit in the US Senate gallery when they're in session and find me one fat Senator.
As an atheist, I'm discriminated against, and I discriminate against religious people.
Dress poorly and most people will discriminate against you - I won't, I'll probably hire you, everything else equal.
Income is only one of many 'discriminations' that we all face.
"And we still don't have income equality."
OK, and why do you presume that is a result of a governmental action? Wait, let's start earlier - why do you presume that is an inapropriate outcome? Do you think that male and female employees pursue the same career tracks, are equally competitive, and are equally aggressive in taking risks and demanding more money?
(Note: female investors are notorious for avoiding risk taking and underperform the average male IRA/401(k) because of that - is that discrimination too? Should the government square the final balance of everyone's 401(k) and IRAs too - because there is a 'gender disparity' in portfolio performance?