If you look at statistics like labor force participation for men or real wages for men by age by year, you'll see the justification for belly-aching. Then consider lack of legal equity regarding parenthood, specifically that women can opt out of unintended pregnancy but not men.
Obviously, blaming women is pointless and unjustified, but blaming the other gender is how the women's right movement works. The world is full of people with legitimate complaints who lash out at the wrong people. Society doesn't seem to show any consistency as to who will be heard, and who will be humiliated.
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