I never feed my gang peanuts and I tell other folks in the park, feeding them with peanuts, to bring real nuts and dried fruits instead, due to the fungus issue.
That being said, most of the food they consume is stolen right from the park tables, from food containers and beach bags. They all learned how to open lids, chips bags, fast food plastic boxes, you name it. When they see or smell fries in any container, they will go nuts, and they will bite folks if they try to get a hold of their container. Most just give up at that point and start taking photos with the squirrel raiding the container.
And they are all Doritos addicted.