That would be me.
When it's prima tossers like the Nani/Ronaldo sort, waving the invisible card is infuriating to see but I think it's circumstantial. When I play, and if I've been wiped out or seen a player on my team been wiped out and the ref doesn't do anything I'll sometimes without thinking say "surely that's a card", as it's frustration.
I guess when it boils down to it it's the ref's job to take the appropriate action, but I can sometimes understand it.
I've set myself up good and proper here haven't I....