'Tenacious' players can get out of my living room. Any RPG relies on some good faith communication back and forth between the GM and players. If, as the GM, I set expectations about how to approach stating and adjudicating actions and a player is willfully and continually ignoring those instructions and expectations then he's going to find another game. GMs need to remember that they set the expectations for game play, not the players. Ideally the conversation about how things were going to work would have been handled in session zero so that misunderstandings were few and far between, and everyone got to say their piece, but if things have deteriorated or gotten out of hand it's on the GM to may down the expectations and the players to do their best to comply.