guttersniping 

Standing on the sidelines taking cheap potshots at the players in the actual game.

"As per a couple of posts it is a real shame that childish guttersniping may be standing in the way of supporters being able to present their concerns and having them discussed openly and fairly."

"She provided such a fine contrast from the guttersniping that's been coming from Hillary lately."

guttersniping by Angus Brody December 1, 2011