« a demand for a flawless human who is always genuinely nice, polite and only makes perfectly inoffensive jokes and never raises their voice while arguing things »
Yeah, that sounds similar to the frustrations I've heard from women and people of color, being held to a higher standard than their white or male colleagues.
I'm societally allowed to be rude, even threatening! And I'm rarely called on it. But that's not actually a good thing.
So I think it's totally fair to have a CoC that says "be nice to people" and has some teeth and makes white men a little nervous. "A little nervous" is kind of a baseline for a lot of people. Think of it as educational.
Even the exact same document will make people feel more or less comfortable depending on other factors like the culture of an org or the people you commonly run into.
Or the examples are strawmen. You can easily spot these by a nonspecific, generalized language or lawyering up.
Our rule set (not some CoC) provides concrete examples of acceptable and unacceptable behaviour. (Quotes and actual descriptions of things that actually happened.)
This is mostly a gut reaction, a feeling that CoCs serve more to tighten the overton window and fear that I might find myself on the wrong side of sharp demarcation which should be more of a soft gradient. It's like a wanted poster, being declared a thought criminal.
Of course many things in a CoC are individually sensible rules, but as a larger set they feel like a demand for a flawless human who is always genuinely nice, polite and only makes perfectly inoffensive jokes and never raises their voice while arguing things etc. I'm quite aware that I am not that perfect human, I have issues with empathy and following what was considered group consensus (it has cost me friends and a job before). Those CoCs just feel a bit like a "only people with A-grade social skills welcome here" sign to me.