I'm sorry but it's incorrect to say that men don't all benefit when women are dehumanized. This dehumanization sets the tone for our culture; it allows women to be viewed as objects when it's convenient, which in turn normalizes sexual harassment and "banter" - and allows men to avoid having to do any work.
The dehumanization also seeps into the workplace; when 'banter' is left unchallenged it impacts the culture. Workplace culture is already heavily bent towards men, and until women are seen as equals, men are always going to be the beneficiaries.