These guys have sat in class rooms with NBA refs telling them what is acceptable and what is not. The coaches have told them. They have seen video made by the league showing what is good and what will not be tolerated.
Its not like these guys just crawled out of a hole and have to figure it out.
The Refs in return have to not respond to the threats either and not be arrogant in return. This is the reason for the rule is that it helps both the players and the refs better understand. I think the refs the last few year have crossed over the line also in repsonse to players increased emotional outpouring.
It was only a matter of time until somting really bad was going to happen. Divas stars (usually Captains) should have more leeway to talk to the refs.
Rashweed Wallace was almost unwatchable
The game is played for the fans enjoyment.