Because in a traditional patriarchal society, good and honorable traits are expected of men while women are expected to be inferior to men.

However as we’ve realized that women are equal to men and should get equal rights, many men have become whiny bitches who yearn for the so called good old days. Said men don’t seem to realize however that “back when men were men” refers to standards they themselves don’t fulfill. They just want the gender inequality back and that’s it.