Ask anyone who has been stung by fire ants. The ants will crawl up your leg and all sting at once. You don't have just one ant sting, you often have a group of ant stings. They'll hold on to your skin with their mandibles and then deliver several painful stings. You end up with a white pustule in the middle of each sting, which is very unusual for ants in the West.
Human health is a major concern with imported fire ants.
But their undesirable characteristics don't stop there. They can eat plant material and trees. Their mounds can be a nuisance and cause damage to farm equipment. In addition, they are a danger to our natural environment. They have been known to kill small birds and animals by attacking and stinging them.