In Tales of a Fourth Grade Nothing, how does Peter feel when Fudge is chosen to star in the Toddle Bike commercial?

Peter is hurt, angry, and disappointed when Fudge is chosen to star in the Toddle Bike commercial.
In the story, Peter and his little brother Fudge look forward to a weekend with their father, Mr. Hatcher, while their mother is in Boston. Mrs. Hatcher's sister has just had her new baby, so Mrs. Hatcher is flying to Boston to provide any help and support the new mother may need.
When Peter and Fudge accompany Mr. Hatcher to his office, they meet their father's new secretary, Janet, who has been tasked with watching them for the morning.
During that time, Peter notices a group of children and their mothers in the building. Janet tells him that the children are auditioning to be in the Toddle Bike commercial.
Interestingly enough, Mr. Vincent (the president of Toddle Bike) chooses Fudge upon seeing him, even though Peter's baby brother isn't trying out for a role in the commercial.
When Peter finds out that Fudge will be in the commercial instead of him, he is hurt and angry. Despite this, it is Peter who saves the day: his efforts encourage Fudge to perform (ride the bike properly) for the camera.