And I have done that myself aswell! The golden rule here is don’t make a big issue about it and put both hands behind your back (with a pen/pencil in one) and tell the captain to pick which hand is it in-simple.
He has drawn attention to himself by doing the rock/paper/scissors for all to see.
Not as if it was for a goal deciding decision for fucks sake! Would have understood if he asked them to play snap or something, just pointless and harmless
Dermot Gallagher says in a Quickly Kevin podcast episode that he did exactly the same thing in a game with Ronaldinho as he left his coin in the changing room.
I dont see how it is any issue. Ridiculous that he should receive a ban for that, but refs in general make terrible decisions week in week out that affect the outcome of the game.