The difference is that men don't face barriers to entering and progressing within woman dominated industries or positions. Their skills, motivations, competence, etc are called into question because of their gender. They don't face sexism or harassment in the workplace. They aren't passed up for promotion or pay raise that go to their less qualified colleagues of the opposite gender. When your peers start telling you there's a problem in the industry, don't try to derail the conversation by bringing up other industries or saying that women just are choosing to join other industries.