I like what's in your Code of Conduct. That's pretty much common sense and good to be manifested. Apart from that, I don't think it's necessary. I'm very active on Stackoverflow, and I haven't seen a single quality post where the user had to suffer from anything of what you've listed under
Unacceptable Behavior
What you are doing with the Code of Conduct is like treating the symptoms of a disease, not the disease itself.
Instead of spending time on rewriting / extending the be nice policy, I'd suggest to put all your effort into
How can people be teachedtaught to write good questions.
Once things like “Ask a question” wizard prototype are implemented, improved and really used, most of the so called unacceptable behavior will vanish, because it's no longer needed to ask someone to google before asking a question (and the other things) - your question filter and wizard should already have handled this.
No discrimination of any kind. This includes any language likely to offend or alienate people based on (but not limited to): race, gender, gender identity or expression, English fluency, sexual orientation, disability, mental illness, nationality, neurodiversity, physical appearance, body size, or religion.
That's common sense, I've never seen anything of that on Stackoverflow
No harassment. This includes, but isn’t limited to: bullying, intimidation, vulgar language, direct or indirect threats, sexually suggestive remarks, patterns of inappropriate social contact, and sustained disruptions of discussion.
That's common sense, I've never seen anything of that on Stackoverflow
Apart from that, like said above - it's always better to be in a friendly environment; that's why I like the manifestation.
I strongly recommend though, to look on what is StackExchange doing to force unacceptable behavior. That is, letting people bully existing users with tons of unanswerable/no effort/... questions. It's on Stackexchange to do something against that.
Stackoverflow is the best source on the internet to get answers to programming questions, no matter how hard they are to solve. We shouldn't do everything to bring the quality level to reddit. That exists already.