If you can't post something nice, don't post anything at all, I suppose. I would be interested in studying a one-week eoff ban on all sarcasm, sniping, complaining about others or any arguments that contain personal insults toward one's opponent.
It can be amusing yet bothersome when groups of people are polite to the point of dysfunction: This happens sometimes when I'm walking somewhere and encounter either a passer-by or a car at an intersection and we become trapped for hours in a desperate battle of wanting to let the other person go before us, sometimes if we are lucky one of us will have a box of crackers or some dried fruit on hand - we are always very careful to share and mind our p's and q's ^_^