non-constructive negative or derogatory manner Should say "non-constructive or derogatorty manner". The word negative should not be in there at all, because many comments for improvement might very well include some negativity. Criticism, constructive or other, is negative by its very nature. But really you should define "trolling", and then say "Trolling will not be permitted", but it seems to me that that's already in there. So what's going on anyway? Recent epidemic of trolling or something?