The admins on cRPG are tyrants, more or less.
I've talked to multiple people that were turned away from this mod for the exact same reason as the OP. They join, play a few games, then are banned with no explanation, never to return.
It's something about the community's culture, I guess, that makes people think that it's okay to mete out harsh bans for extremely minor offenses. Only the popular kids get to be admin, and the popular kids all know the rules. So, they expect everyone to be act just like they do, and if you're just a little uncouth or unpopular you're mercilessly banned.
Meanwhile these badmins, worse for the community than any incidental teamkiller could ever be, are allowed (and even encouraged!) to continue acting in this way. It's ridiculous.