You sound like a guy who hasn't been in a street fight before. Generally speaking, there is quite a bit of flailing and most dudes have awful form when throwing punches. Every once and a while, a dude throws a solid punch and ends up knocking out his opponent. You can't seriously believe that you think some dude would have an advantage over someone like Rousey just because he's a dude.
At the 1:19 mark, look how easily she tosses this guy. They're clearly just training, but these dudes know what they're doing and they're trying not to get taken down. It's fair to say that the average Joe would not fair well against someone like her. She does this for a living; She's COMFORTABLE fighting an opponent. You, however, are not. Why don't you try it challenging her and update us on how it went from your hospital bed, Alvin?