Well let's see. I checked on gore, ditto, andrew and effdot. None of them seemed to have been banned, and they were pretty oppositional last night. I suspect management is pretty forgiving of tantrums. The only thing I know of that is unforgivable is going to another site and badmouthing or threatening this one.
So now being oppositional is grounds for banning? Having NO debate is how you avoid opposition.