That is the problem, why does anyone need to be "derided" at all? There are posters perceive as positive, and posters that are perceived as negative. I see plenty of pot shot (and more personal than that), passive aggressive, pissy posts aimed at the posters perceived as negative. I don't see those posters calling out the positivity of positive posters.
If you can't handle it, ignore it. If you really believe any poster needs to be "derided" then you are part of the problem, particularly as a moderator.