Yer deffo not acceptable however there is a little more to the story, I had front row seats for the incident.
Coastal 16 year old gets pole axed by a player who had joked before the game about smashing some schoolkids. It happened right in front of his dad who was pretty pissed off as it was super late and dirty. It woulda been a red if the ref had ended up dealing with it. Dad yells at player and takes two steps onto pitch as that's where his son was lying. Ref tells him to get off his pitch to which he was told to F off. Game immediately called off by ref with 20 mins to go.
Coastal told result stands and that the ref had been spat on at previous Waimak tournament and he wasn't going to put up with anything.
Our supporter was out of order I completely agree, but as you can see there was a little behind it.