Earlier quoted context omitted.
Are you asking if a set of rules used to outline acceptable conduct in project participation has ever been enforced in good faith? Because they have, and I guarantee you that you've been aware of such enforcement actions in the past.
I think it's a good case of visibility; nobody hears about the justified enforcement of a code of conduct, but the odd cases (like the Drupal dev, or Donglegate, or what have you) get tons of media attention and are used as references as to why codes of conduct are a bad thing.
And it's not like I don't understand the baseline fear of bad-faith actors - I've been on the receiving end of a few myself, as have most of us. However, those fears never really led anywhere productive. What _was_ productive was going off on my own and building new things with people I actually enjoyed being around.