The problem is that the Wage Gap is a foregone conclusion, we already know that it exists in the West (esp. the Americas;
refer to Pew Research). At the current time what is up for debate is the amount, as parity has not yet been reached. I believe the U.S. dept. of labor also published a report in which argued that the wage gap was as low as 4-6%, though I don't have a link to that one as it has been a while since I talked about the wage gap.
That said, the wage gap is an especially difficult conversation to have. What seems to always happen is that one side becomes irate due to emotional investment in the issue (i.e.: believing that the cause of the wage gap and arguments about it are due to intentional discrimination than implicit bias or ignorance), and the other side will put forward arguments that are only plausible explanations to laypersons (i.e.: people who sit and argue that not all factors are accounted for, ignoring the fact that it's people's job to account for whatever factors could impact studies done on employee wages).
** EDIT **
I believe this is the report, quoted the relevant section to what I was stating, though will have the full document linked below:
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Source