The rule has not been touched for a long time as far as I know, well, at least upon my arrival it was there, so as long as there were no complaints about it and most people were following it(and the rest would get punished) I couldn't bother changing it. However, I cannot keep eyes 24/7 on the server, you(players) and admins are my eyes, if you see something immediate action can and should be taken(report if you're a player/punishment if you're an admin) so such things could be ceased. Of course I will keep an eye on the logs as well to see the behavior of our admin team and if such silly CT commands are not prevented by the admins then action will be taken on them as well.
So to answer your question, no, direct swearing at any person in purpose to offend him is not allowed and must be ceased at all times, and if an admin is seen not to warn/take action for such an important rule there will be consequences. Next time you hear a CT give such stupid commands please report him.
Regards.