"There is definitely social sexism being surfaced by the wage gap statistic, but it's against men, not women."

I would say against both genders.

It is more complicated than I let on and not as simple as class X is victimized. However, it's frustrating that this pushback happens only when a random internet comment is oversimplifying in the men have it worse direction and never when a massive institution is oversimplifying in the women have it worse direction.