Truthordeal, I'm astounded that you're missing not just the gravity of wage sexism, but that it exists at all.
Sure, employers do try to Scrooge anyone they can, and doing so isn't inherently sexist. What you're missing is the simple fact that the reason for females being Scrooged so extensively is their sex. It's as simple as that; that's why it's such a major sexist issue.
If these employers were thinking, 'Hey, this person is obviously malleable; let's try and Scrooge 'em,' for any reason other than applicants' sex, it wouldn't be sexist.
But, as I'm sure you realise, that's rarely the case. Many employers consciously lowball females, and all those who do and more do so for unconscious reasons because of deeply-set sexist prejudices that they don't even realise.
If you really think that employers intentionally exploiting females through wages isn't a huge issue, or that wage disparities are just a coincidence or, worse, that it's the applicants' faults for 'letting themselves be exploited', you really need to wake up and read up. Wage disparities are one of the most accessible and acknowledged examples of sexual inequality, and yet you're failing to grasp even the basic issues at work here.
I think you'd do better to take a break from these issues in the arena of 'debate' and read up on the basics of sexism issues or even just look into basic examples of sexual discrimination. Heck, just open your eyes to the possibility that sexism is anywhere as much of an issue as Z and J claim. It's so widespread in society that to be so unaware or denying of it, you must have blinders on against it or spend an insane amount of time denying it, consciously or otherwise. You don't have to take anyone's word for it, but if you analyse even a fraction of what you see day-to-day, you'll see how rampant sexual inequality is. Better yet, think about how your own behaviour towards and preconceptions of other people changes based on their sex. Regardless of whether you agree with what you might call the more extreme positions opposing you in this thread, I think you'd do well to at least open yourself up to the premise that sexism is a massive problem by looking out for it yourself. It's hard to grasp social issues you've no experience of, you know? If you're disagreeing over something as elementary as wage disparities, you have little to gain from this thread, regardless of whether you're right or wrong.