Read an article this week about football crowds which made much the same points.
Everyone now thinks they are a Fantasy League Manager, message board sage or Sky TV commentator and can see things that the players, coaches and even referees miss or are just not as expert in the game as the 'fan in the stands'.
The concept of the 'supporter' (black and white tinted specs included) who cheers his or her team on when playing badly as a form of encouragement is openly derided. We may have thought this was a result of the 'Agar out' era but regrettably it is now the default mode for most people attending professional sport.
Just wait for the first time Wilf Sharp drops a ball, Richard Horne is tackled in possession, or an opponent breaks a tackle and someone and his mate will start mouthing off. If ever a player does something well the best you can hope for 'why doesn't he do that all the time'