As soon as the thing you made up becomes a rule. (Never.) 
As I always explain when this gets asked, Der Trihs and many other people of any and all political persuasions have been modded for off-topic or otherwise unwanted posts. The moderator instruction wasn’t “all posts must be constructive and on topic,” it was:
Der Trihs has often been accused of making ludicrous generalizations, but he typically doesn’t respond to people’s ideas by literally saying “Boo hiss.”