As always, the OECD is leaving out other massive gaps. For instance, the working hour gap: even if you limit yourself to the class of full time workers, men work more hours than do women. There's the work satisfaction gap: women work in jobs that offer them more work satisfaction than men. There's the commute gap: men spend more time in their commutes per week than women do. There's the retirement gap: full time women retire years earlier than full time men. There's the workplace risk gap: men are far more likely to work in jobs that cause them injury or death. There's the on-call gap: men tend to work more inconvenient hours and do work outside of normal working hours.

I'd love for all these gaps to be reduced, but the situation is less "patriarchy stealing money out of women's pockets and undermining equal pay for equal work" and more "men face strong gendered pressures to sacrifice well-being in exchange for more income." There is definitely social sexism being surfaced by the wage gap statistic, but it's against men, not women.