I'm a women and I don't see the whole 'supernatural is the worst ever to women' thing. Not with the unconventional way Sam and Dean are treated as male leads.

Just off the top of my head a few scenes you could add are the a rapey ghost that attacks Sam in the pilot.
The gratuitous objectification scene in Phantom Traveler where Dean is laying in bed and is leered at by the camera.
And in Dead Man’s Blood Dean is used as bait for the vamps and one smacks him to the ground then kisses him.
Those are weird situations to see male leads in and Supernatural doesn't seem to care.