Is hurling abuse an integral part of sport? Especially among spectators? Is it just part of human nature, and all we can hope for is to discourage people from hurling particularly nasty forms of abuse (eg, racial slurs)? I'm quite sure that some spectators have been racially abusing players ever since the first non-anglo player joined a team, and the only difference now is that the media is reporting it and the authorities are rightly condemning it. I certainly hope it's happening less now than it would have in the past, but if some people feel a need, or a right, to shout and curse at people on the field, be they players or umpires or whoever, then this is going to keep happening, because abusive spectators will latch on to any trait they can think of to insult.
(I was at a Hawks/Pies game many years ago, and a middle-aged male Hawthorn supporter behind me kept shouting at Nathan Buckley whenever he was in the area, "You've got a fat arse, Buckley!!" I was that close to turning around and telling him to STFU, but I learned early on that telling abusive spectators to shut up will only earn me some of the abuse. It's things like that which put me off going to more games. Is it acceptable to abuse a player's physique? Their hairstyle, choice of facial hair, tattoos? Where do you draw the line, if there even should be a line?)