Why aren't boys who beat girls in sports celebrated?

When a girl beats a boy in a sport, lets say wrestling. Her victory is celebrated. And that's seen as an example of "girl power." But if a boy beats a girl in wrestling he isn't celebrated. Shouldn't we celebrate him for winning? And aren't men and women supposedly viewed as being equal by society? So shouldn't we celebrate him for beating his female opponent?

Why aren't boys who beat girls in sports celebrated?
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