sorry
Explanation
In this comic, two children are playing doctor -- a classic childhood game. However, instead of using a toy stethoscope or pretending to give a checkup, one child reads from a piece of paper and tells the other: "I'm sorry, you're not in-network. We won't be able to deliver on a memory you will later see as funny, yet strangely beautiful in its innocence." The caption reads: "American kids don't 'play doctor' like other kids."
The joke is a sharp satire of the American healthcare system, specifically the problem of insurance networks. When a doctor or hospital is "not in-network," patients face dramatically higher costs or outright denial of care. The comic takes the innocent childhood game of playing doctor and replaces the medical roleplay with the bureaucratic nightmare of insurance administration -- suggesting that American children, having absorbed the reality of their healthcare system, would naturally simulate the paperwork and denial-of-coverage aspects rather than the actual medical care.
The added layer of irony comes from the child's oddly poetic language about "a memory you will later see as funny, yet strangely beautiful in its innocence" -- which is exactly the kind of nostalgic framing adults use for childhood games, but the child is using it while performing the least innocent, most cynically adult aspect of medicine: the insurance denial.