Sin bin for dissent? There's an alternative - referees could grow a pair and issue yellow cards for it, left, right & centre, until it stops. For years they've had a simple power in their hands to curb dissent, but they just don't use it. I blame referees for much of the state the game (on the pitch) is in. If, as a group, they demanded respect for their authority (or else...) they'd get respect. The only reason players behave so badly is that they're allowed to.
Everyone knows footballers can be a bunch of cunts, so they need to be treated that way. They'd soon stop, because they may be cunts, but they aren't all daft (except the likes of Harry Maguire, etc).