Indeed, gender disparity in Japan is huge.
And I doubt if there has been any significant improvement since feudal era, the time Japan was under the reign of Shogunate.
Look at page 11 of below report, and you will see Japan is ranked 114 out of 144 countries, next to Guinea.
http://www3.weforum.org/docs/WEF_GGGR_2017.pdf
Following is an article from BBC headlined as "#MeToo hits Japan as Junichi Fukuda quits over harassment claims"
http://www.bbc.com/news/world-asia-43819001
It seems that global movement of #MeToo tsunami finally reached out to this island.
I do hope many women this time will stand up and fight against such a long-lasted mistreatment and abuse.
That being said, please don't rush to the conclusion that all Japanese guys are either arrogant or pervert.
Most of us still abide with so-called samurai spirit - being kind, lenient, benevolent and aboveboard.
Yes, we surely do, don't we?