Good question! Maybe we should just ask them directly. OK let's hear it, all you gay men out there: Who considers women to be inferior to men?
Not in some of the bars I've been in!
How did men get so dominant and sexist in the first place?
The lust for power. Don't you want to have control of the situation?
In the past physical strength (seen as a masculine trait) was very much a part of that.
Feminine is seen as weaker and less desirable in that context. (This is not my personal view, don't be coming after me with no shotgun now!)
That's why lesbian (more like men) women are seen as more desirable and homosexual (less like men) men less desirable.
This selfish lust for power is being replaced in some quarters by the realization that everybody working together for our mutual benefit yields more economical, longer lasting results.
The selfishness partly depends on whether you world view is "There's not enough to go around" or whether it's "Together we can make enough for everybody."
I guess my short version is it's a racket perpetrated by the "might makes right" crowd.
The ironic part of course is "It's the hand that rocks the cradle that rules the world." So where are these men getting all these ideas from?