If they weren't banned that was a mistake on the mod's part. FF asked what reasoning there was for the initial ban. I gave him that reasoning. Insulting the site is not criticizing the site. His post after the insult may have been criticism, but he started with an insult, which directly contradicts the forum rules, and common decency in general.
Which forum rule is that in direct contradiction with? I think the whole point here is how things are interpreted. It would be helpful to know what the words are exactly and how you're interpreting them.