Rousey is at the top of the physical pyramid for females in many respects, and she deserves to be there because of her hard work. "Not a do-nothing b***h" indeed.
But when a woman is at the absolute peak, she is, at best, only going to be 75% of what a male at his peak is going to be when adjusted for size and weight. No matter how dedicated she is, no matter how hard she trains, she is going to be at a significant physical disadvantage. And when you get any athlete who is 25% less capable than another, it is going to be no contest, and by a huge margin. Just look at marathon runners...in the Boston Marathon, the top female runner crossed the finish line 15 minutes after the top male runner.
Think about what that means, when the difference between first place and second place has been decided at times in fractions of a second. It is an unbridgeable gap.
Men have the unfair advantage of nature with their natural internally produced supply of steroids. It is a fact.
There are women out there who buy into the television shows that show a woman kicking the collective butts of 10 men in hand to hand combat, but it simply isn't reality. It is scary, that to many (including those who create legislation) it IS reality.