Less than 0.1% is a pretty decent statistic in most cases. Of the thousands of developers who presented at this forum, only a VERY small handful made childish/offensive apps. That actually shows that the VAST MAJORITY of developers have better things to do than waste their talents on fart apps or whatever. Sure, you can focus on the 3 or 4 apps made by buffoons, but that does a discredit to the thousands of folks who made seemingly useful or novel apps.While only a few of the probably thousands of apps displayed there were sexist or belittling to females, that's still 100% more than ones aimed at men.
If less than 0.1% of a particular population is doing something you're against, then that's absolutely fantastic. Cities that don't necessarily have a crime "problem" are still within 0.01-0.1% crimes per person.
Given that there were likely significantly less women than men (hence this entire topic) at the hackathon, you're less likely to see the outliers and statistically insignificant data occur. If you boosted the presence of women to the same scale, I wouldn't be surprised if you had someone out of the thousands create "dickstare". It might be a weird concept for puritan Americans to understand, but women are totally human, and enjoy things like sex, too.