I would be very careful when appealing to gender ratio because the mere presence of a gender disparity does not imply an obvious cause of the gender disparity (

I would be very careful when appealing to gender ratio because the mere presence of a gender disparity does not imply an obvious cause of the gender disparity (nor does it necessarily imply a problem, for that matter). It may very well be the case that women naturally tend to choose different kinds of occupations. For example, if a bro culture does exist, then it may very well follow from the gender disparity which is itself the result of other factors. This may in turn create an environment that is unappealing to the women who do enter tech.