And I never even attributed the emotional detachment of the male gender to this gender bias. Have you?

Definitely have. An education and media studies course many years ago opened my eyes to how incredibly biased the media is, and how biased teaching methods can be, in ramming men and women into their pigeonholes, whether they fit or not.
Men outside of western "civilisation" don't seem to be socialised in the same way. And I think "working class" blokes seem a bit less repressed, at least the ones I know. But maybe its because I don't expect repression from men that I don't see so much of it.