I should have been more precise. I agree with you that PyLadies and Women Who Code should not be labeled as sexist organizations. There's a distinct difference

I should have been more precise. I agree with you that PyLadies and Women Who Code should not be labeled as sexist organizations. There's a distinct difference between targeting a group of people based upon their sex and baring a group of people from an activity on the basis of sex. The two organizations you mention target software engineers who are women and chip away at the institutionalized sexism in the industry. On the other hand, having a qutota is a discriminatory policy. By definition, a quota is saying, "we're not accepting you because you are X." In this case, X is "a man." It's a subtle difference, but at the end of the day, sexism is discrimination on the basis of sex. Thus any practice that discriminates on the basis of sex is sexist.