Lately I've been actively avoiding giving my time to open source projects that have CoC's like the Contributor Covenant[1], mainly because - if my experience is anything to go by - they are a strong signal that the kind of people I wish to avoid will be involved. I want to contribute things that (hopefully) improve the world in objective ways, not be involved in the wrangling and petty politics of a fiefdom just so I can get something like a bug report considered.
If I had to choose one CoC to implement, it would be NCoc[2].
[1] https://www.contributor-covenant.org/version/2/0/code_of_con... [2] https://github.com/domgetter/NCoC