This is an article of mine lamenting how the code of conduct trend has not changed anything for the better.
To the contrary, I believe the massively popular Contributor Covenant (the specific CoC now used everywhere, even by Linux) is arguably sexist/misogynist in nature, and can be used to harass feminists.
Specifically, I was hounded out of the Guix community for daring to suggest that the CoC should perhaps include the term "sex." (You know, whether someone is female or male.) It does, after all, list everything else under the sun for which you could be discriminated against.
Eventually, they included "sex characteristics" in line with the changes made upstream in the C.C., but I'm unhappy with this for reasons outlined in the article / in the GitHub issue mentioned in the article.
To be honest, I've grown overall highly skeptical of CoCs, and believe they've become tools to push specific political views instead of foment a friendly and inclusive environment. (Yes, I know some will say "duh" but I used to be very optimistic.) This article is, however, written from a very pro-feminist standpoint, so be wary if that's not your cup of tea.