Full disclosure - I am a man
Obviously not read the full content of your sons writings, but you might be jumping the gun a little here. Life as a man is not the same as a woman, there are a large number of points that are obvious where women have it significantly worse.
However, that may not be what he is talking about. Life as a man without significant wealth does have a whole bunch of requirements, expectations, problems and issues. That they may be the same, worse or better is irrelevant to some degree as he may well be looking at his personal near future and seeing what is coming down the track and wanting to explore that.
By all means discussing how life can be crappy from women is very valid - but maybe it would be worth spending time to see if his thinking is rooted in the: "Women leech off mens labours, its so unfair" which must of course be countered or simply:
"Hells bells - there is a lot of demands on being a man that I am becoming, that looks frightening"
which deserves exploring and comfort rather than trying to get him to put his worries aside and only focus on the troubles of women.
Adulthood is not so far away anymore, he may have already been treated as if he was Schrodingers rapist - I had by that age. I was just in my school uniform walking home alone - I remember it really clearly more than 30 years later. After being warned about the evils that some men do all my life - suddenly being treated as if I was the evil man was very unsettling,