amen to that! we have a guy who loves to call out on the DM "but the rules say..." when the DM makes a decision... i just want to slap the guy. the rest of us usually have to talk him out of arguing it, while he grumbles and mumbles and flips through the rulebooks to try to prove his point, and then if he finds what he was looking for he brings it back up again several minutes after we have moved on, and if he doesn't find it he says something like "but you've let me do that before"
...oy. i'm kinda glad he hasn't shown up in a month or so.