Though part of being male is being more aggressive/competitive biologically speaking I would hate for someone to impose on me to act unlike myself just so I'm more neutral when it doesn't harm someone.
Women are not the perfect human being by default and neither are male tendencies evil by default.
It's no real problem to have differences between the genders so this forced assimilation is off putting, particularly when men are appreciated for who they are. If I wanted a girl I'd be a lesbian.