Why has masculinity become a dirty word?

Imagine the following scenario. It is decided that there are aspects of female behaviour that are deeply troubling. Indeed they are so troubling that a phrase enters the language, first on the campuses and then across wider society: ‘Toxic femininity’. It’s an ugly phrase to be sure, but even those who recognise that also recognise that it would be unwise to deny its existence. Eventually a new generation begins to take the existence of ‘toxic femininity’ for granted.