If you are so worried about fan conduct, all you need is one simple code: What gets you tossed as a player can get you tossed as a spectator.
You know, if folks spent as more time worrying about teaching kids to play and less time mandating how their fans behave, we might find more interesting games and better-behaved spectators. It so often seems to be the case that the better-played games are the ones with less trouble.
There really is something to be said about "it's not whether you win or loss, but how you play the game."