Exactly - all contact with an umpire is wrong, but some contact is more wrong than others.500 times over and shoved, I actually can’t remember the Dusty incident and can only find footage and articles about him colliding with that goal umpire so could be wrong, but Neale’s was certainly not a shove.
The tribunal decided that Greene’s action was intentional, disrespectful and intimidating but not forceful hence a three week ban.
Neale’s contact was intentional, but not intimidating, disrespectful or forceful as he was just trying to get the attention of the umpire for a blood rule. It’s still not appropriate to touch and umpire hence he was still sanctioned, but it’s not bad enough to warrant a suspension.
It’s pretty simple if you actually think about the levels involved in coming up with the penalties, I feel like you just want to make it black and white so you can be outraged.