There's a huge difference between being negative and being critical. I'd say you and Chief do a good job in being critical. Most do. And being critical is necessary to discussion. But there are some ... and there is a bit of it on both sides ... that go off the deep end and are not supplying any critical thought.
I dislike the monikers 'negative or positive' because those are subjective. But I do apply 'negative' to those, for instance, in game threads, who wait for the Twins to falter then choose to enter the threads right then to express how awful everything and everyone is, making sarcastic comments about the team, ownership, management, etc. These are posters who don't participate in any meaningful way in any other instance. The 'drop by venter' only appearing when things go bad.