Chief Hopper teaches his kind not to underestimate small ants for they can unite into a mass group and defeat the grasshoppers. To Hopper, the core to control smaller species is to manipulate their mentality: continually frightening them, imprinting in their minds that they are powerless, keeping them away from the thought of uniting.
Tommy and his friends learn about "fairness" from a bigger kid. He incorrectly explains fairness to be in his favor. The kid does not inherently know how to play by the rules and instead uses fear, intimidation, and manipulation to gain the advantage and have things go his way.
Haley needs to bake cupcakes for a school fundraiser and wants her mother to bake them for her. She purposely misrepresents her baking abilities in order to convince her mother to take over the baking process. After her mother bakes the cupcakes, she throws them in the trash so that Haley has to bake them on her own. Haley's parents taste test her cupcakes, and although they claim the cupcakes are delicious, in reality they are unsavory.