Do you read the code of conduct when you attend a conference? Personally, I haven't even read the code of conduct for my job, and certainly wouldn't read one if I was speaking at or attending a conference.
The CoCs are completely unnecessary and, as shown in this example, arbitrarily enforced. In the blog post I read that their CoC prohibits threats and assaults. Consider how silly that is. If someone's threatening you or sexually assaulting you you're going to go the police, not report them for a code of conduct violation.
Likewise, for more mundane stuff, it's all common sense. Don't be obnoxious, rude, make people uncomfortable, etc. If you are doing that, they'll ask you to leave and ban you from future attendance if it's severe. You shouldn't need a CoC to know that and they don't need one to do it.
Consider something that's not covered by their CoC. Maybe I bring my pet skunk with me and they don't have a provision about skunks in their CoC. Are they now powerless? No, they're going to do what's sensible and ask me to not have the skunk, and if I say "Your code of conduct doesn't prohibit skunks" they're going to ask me to leave.
Codes of conduct are silly. They create these dumb regulations and committees for no real reason and create the apparatus for mistakes like these.
I'm actually shocked that Jeremy supported and still supports codes of conduct. He seems like a smart guy and they're obviously a bad idea.