Panel 1: Since all he really bothered learning about Mike (because learning who he is and how he got that would get in the way of resenting him) is that he tends to delay decisions for as long as possible, John is all smiles as he tells Mike that he's got him a summer job. It's only three hours a day and he can choose his shifts. Since Mike doesn't like the idea of being a wage slave like a boring, ordinary person, he starts to object.
Panel 2: John talks right over him when he says that one of his patients is hiring kids Mike's age and he'd really like him to meet him this evening. Again, he starts to object only to be cut off.
Panel 3: As they drive downtown, John is beside himself with glee when he tells Mike to believe him when he says that this is a wonderful opportunity and if he was his age, he'd think it was perfect.
Panel 4: When Mike says that John's perfect opportunity is working at a hot dog cart called "Walt's Weenies", he's horrified.
Summary: Oh, dear. The poor boy. Instead of being this awesome dude, he's another anonymous drone wearing a hair net asking us if we'd like to gargantusize our order. For someone with his exaggerated dread of public humiliation, he's not going to see this as paying his dues like everyone else. He's going to see it as yet another means by which everyone laughs at him and would be baffled by kids who actually would like to do something easy like this. In this, he is like his creator who does not realize that most kids wanna do something wicked easy like this if it means making reams of spondilucks.