Yes, I too am offended that an organization would dare donate anything to the Ada Initiative. Since we obviously live in a post-sexist egalitarian society, any sort of donation to one organization is clearly discriminatory against those not part of or benefitting from the organization!
</sarcasm>
I'm pretty damn sure GitHub can't affect the salaries of women that aren't direct employees of them. In what way does GitHub doing what it can do, which is donate to an organization like the Ada Initiative, cause offense?