I saw the mouthguard thing and thought WTF?? But JSOS doesn't get away with putting the ball down on the ground after a point is kicked which I'm not even sure is an infraction (and neither did he, or the commentators). The best I saw was Young twice really retain himself and even from his expression held himself quite well after some iffy free kicks against. But the Adelaide players seems to think not looking at the umpire whilst yelling under their breath and clenching fists and having steam coming out of their ears is not dissent.The demonstrative stuff is what will work. They just have to enforce it. One umpire tonight paid a 50 against Keays for getting an earful not once but twice. That was a correct interpretation and sends the right message.
However, Frampton legit kicked (drop punted) his mouthguard away in disgust in what was plainly dissent and went unpenalised.
Rugby League and Union do it well. Basketball have mechanisms to tackle it (techs, disqualification). Umpiring is hard. Need to give them mechanisms to say enough is enough.