I think the gap is much larger in these sports that have large gaps in participation between males and females. The male recreational snowboarding population is double females, and I'd guess that is even more pronounced in competitive snowboarding. It also doesn't hurt that it is a more lucrative sport for males, which means better access to coaching, technology, and more incentive to keep going in the sport.
Genetics is a significant factor, but I'd guess the gap wouldn't be nearly as big if the pool of competitors and money was equal to both sexes.
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