I have a hard time believing that most people - at their worst and caught at the wrong moment - couldn't have made themselves feel a bit foolish although perhaps not generating a similar amount of outrage as these idiots did. All it takes: once.
Today it was Giles Barnes called the c-word, tomorrow it's a few members of a women's soccer team who sat three rows behind you and twelve seats to the left who had to listen to the word cunt for 90 minutes that you inadvertently made feel inadequate. Did you call it to them? No. But I doubt if it fell on the wrong ears they'd care.