I agree about straight dissent. Of course that should result in a booking (or worse)
But I've played so many games where the referee has had no sense of logic whatsoever to be able to interpret things. Refs like that are annoying... for no matter what reason they will reach into their pocket. You see it in Spain a lot, where you get matches ending with about 6 bookings on each side. Or like those second yellow cards we saw in the champions league a couple of years back for sarcastic clapping of the first yellow ... quite pathetic.