People aren't arguing that women and men should be paid differently on the basis of their sex. The argument is simply that it doesn't make any sense to look at two disparate figures and assume they differ primarily due to discrimination.
The pushback so far has actually proven that this is sensible, as the more confounding variables are accounted for, the more the gap decreases. You'll notice that up until a few years ago, and sometimes to this day, pundits, professors, politicians, presidents and the public at large were completely comfortable stating that "women make 77 cents on a man's dollar." People were prepared to legislate for "equality" on the basis of this fact alone. But some people correctly stop and say, "Wait, but why? You're prepared to legislate, but you're just assuming that they're paid differently because of sexism you're attempting to correct."
Well, it turns out that the 77 cents on a dollar was arrived at by literally just comparing what women at large make vs men at large. But do men and women do the same jobs? Do they even work in the same fields? Depending on profession, the answer is a resounding no. So then the question becomes "do women doctors at this hospital who see the same amount of patients and work the same amount of hours and have the same track record and went to the same school and have the same seniority etc etc make less than the respective men." The more that is controlled for, the more the gap disappears.
What you are saying is that you can't believe sexist Americans stuck in the 1950s aren't prepared to legislate to remedy this issue, and that the pushback offered in this thread is evidence of people uninterested in gender equality. That's just not even close to the conversation that's being had, and I'm personally glad, whatever the topic, to have as much nuance brought forward as possible. Nobody is arguing against equality, it's just that you're mistaken in your assumption that this is what _you_ are arguing for.
Also, regarding the UK, please note Carl Benjamin, Paul Joseph Watson, Nigel Farage, Helen Pluckrose, among others, if you insist on the assertion that pushback is limited to those outside your country.