I propose a new poker rule

[MicroBob]

"Cardrooms also need to clearly post rules of ettiquette in giant letters where all can see them. "


YES.
I see dealers and other players complaining about the idiots who don't know a damn thing all the time.
Well, it's all some secret code that you're supposewd to learn as you go. So obviously with all the new players coming to the game there are going to be mistakes.
The fact that experienced players also don't even know what the hell they are doing a lot of the time and make up the most ridiculous stuff should really tell you something.

stop keeping everything such a secret. DIRECTLY TELL the players what the rules and etiquette are by spelling it out for them.

Throw in a part about how the rules are there to make the game friendly and understandable for everyone and include something about how angle-shooting isn't tolerated either.

etc etc etc.