Well, that's a RC anyway, so the point is moot.
What I am talking about is this...
Fred Smith commits YC offence (say, a high tackle)
Referee Bill Jones shows YC
Fred Smith says "Oh, come off it ref, he ducked into it"
Referee Bill Jones shows YC for dissent , and RC for the second yellow.
Referee Bill Jones is a dickhead!
in this example, yes, "Oh, come off it ref" isn't normally worthy of a YC ( IMO anyway)
but there IS a level of dissent that would justify a second YC, and therefore a RC.