I'm not going to comment on whether people said what they are reported to have.
One point I want to make is I think efforts like this to combat racism do nothing, and contribute somewhat to the perpetuation of the kind of ideas that lead to racism in the first place.
Specifically in this example, the implication of "monkey" being a racial slur. It has been made very clear that it is considered a slur on the basis of Symond's ethnicity. Leaving aside that no one really knows what Symond's ethnicity is (he was adopted and has no knowledge of his biological parents as far as I know), this is a backwards idea. What they are saying is that this is an insult to Symonds alone. Why shouldn't those with european or indian ancestry be equally offended? Should we not take their being compared to a monkey in the same way? Is this decision implying that Symonds should be offended because he has some relationship to monkeys the rest of the players do not?
In reality, we are all equally related to monkeys. By identifying it as an insult to a particular ethnic group, you are suggesting that there is something different about that group. That's not true of course. Their stated aim is to eliminate racism, but this kind of action only gives the ideas value by recognising them officially, if even by purporting to punish them.
In a game without racism, every player on the field should have an equal right to be offended by the insult in question. This kind of policing does nothing to get us closer to racism free cricket. An aggressive lecture on the intricacies of biology, sociology and anthropology might do something to further the cause through education, but racism usually finds its most comfortable home in a mind equally stubborn and inable/unwilling to grasp such intricacies.
Unfortunately a war on racism appears about as futile as a war on drugs. Criminalising something can inflate its value, whether monetarily or philosophically. It's more effective to fight the idea than the action. The Ku Klux Klan were dealt a more serious blow by exposing how silly their rituals were than by arresting klansmen. If we have any hope it's to discredit racist ideas at every oppurtunity, not to suspend players or ban spectators.