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Are you saying that 90% of the female population has no balls?No. The major hurdles to becoming a programmer are crossed long before it becomes time to put code in a github repository.
> Or is it more likely that due the systemic method of education, girls don't get interested in programming because by the time they are taught it, the boys are in the computer lab making a ruckus and they'd rather go socialize elsewhere.
Given that there aren't any well-considered studies that show fundamental non-socially-caused cognitive differences between men and women, and that behavior seems to be entirely mutable and culturally-driven, then the fact that "they'd rather go socialize elsewhere" is likely the result of considerable cultural programming outside the immediate realm of putting code into a machine.
Of course, it's not that simple -- yours is a broad and inaccurate generalization of what girls want in school, and of how boys behave in school. Personally speaking, I didn't want to spend any time in the computer lab either, because the only people in there were super-nerds playing video games for hours.