Just the opposite: you need the CoC to make sure they do get kicked out. Because for example if the writer of that comment is friends with the moderators of the forum, they might get a slap on the wrist and allowed to continue. Having a written CoC lets people know that the mods can be held accountable to the document. Another example making the same point, this time of actual harassment being ignored: https://www.youtube.com/watch?v=oxLENeCf3OA
>Just the opposite: you need the CoC to make sure they do get kicked out.
No, you don't. You don't need a CoC for sensible moderation.
Good moderation is a combination of clear, actionable rules, good intentions and wisdom. Documents like Contributor's Covenant do not help with any of that. They're vague, their intentions are debatable, above all they're the exact opposite of "wise".
Instead of punishing the other party, you have a choice to ignore that person by setting a filter for that person's email.
This way, if enough people filter-out, the person will be silenced. Others, who are more forgiving, would continue to receive that person's contributions.
My rule is, I make decisions for myself and only myself.
At that point the abusers who move in will realize you can't see them and will harass your members with impunity. That doesn't seem like good community management. Actually it seems like throwing new members into the deep end (exposing them to every bad actor you already knew about) and at some point I suspect the only people who join your site will be malicious.
That is flat out not true. Someone constantly attacking your character to others is going to have an effect. Those other people may be influenced by what that person says, and that will affect how they perceive you, which will in turn affect your involvement in the project.
