The Pork has two general types of chat rooms: system created and user created. The Pork monitors activities in the system created rooms. If there are violations of policy, The Pork security team handles any banning or other actions.
However, users can create their own rooms. Those rooms are largely not under the perview of The Pork, and the owners can ban anyone they want for any reason. If the room creator has banned you, there's nothing The Pork will do. Users have the right to ban whomever they please, for any (or no) reason.