Its the dealer's job to get the showdown moving. "table your hand or muck."
casino dealers are trained very specifically to NEVER say something that encourages or discourages a player tabling his hand. The dealer reads hands once they are tabled, but until they are, they basically can't say anything.
I understand your frustration with showdown nonsense in home games, but most players feel very strongly that the decision to table or muck must rest 100% with the player holding the cards. You will get yourself in a lot of trouble someday if you say the wrong thing at showdown in the wrong context.