If only that were the whole story.
However, first, you said it. Then others said it. Then I announced to everyone that they should keep their language clean. Then you said it again, and so did others, and you told me to, "grow up". Then I kicked you. Then you came back and questioned me further, asked "how is it swearing" (which is not at all the point), and then told me to "grow up" again. I then told you to take it to the forums and banned you for a few minutes while you did so.
If you've played on GC servers before you have no excuse for not knowing the rules. If you look at the MOTD, or any of the banners posted around every map, you have no excuse for not knowing the rules. You should know what kind of language is appropriate in GC servers, joking or not.
Nonetheless, not only did you break one rule and get admonished for it, you pressed the issue as if it's not only your right to flaunt the rules, but also to harrass the admin who attempts to enforce them. My job is to keep gameplay moving in an environment according to GC standards. You were interfering with that. Time for a break.
Warn, warn, kick, ban -- more than fair warning IMO, but I'll happily be corrected if GC LAs disagree with my implementation.
-- Bothrops