Humans can be so dopey! You would think with those huge heads of theirs they'd have more smarts, but it just isn't so. Half the time I'm telling them we need food, they try to play with me; and then, when I'm telling them I need playtime, they give us food!
It's possible they just get confused about which is which. The stretchy red string is for playing. The big bag with food in it is for eating. One does not equal the other!
Training humans can be really tough sometimes.