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Explanation
The Joke
Superman is visiting an elderly couple (one of whom is named Agnes) and insisting that they "say them" -- referring to specific words. The couple is having an argument about terminology: one says "They're just sounds, Agnes. Say them." Agnes refuses: "No! I won't! It's a slippery slope!" The other person counters: "It's not a slippery slope! It's the recognition of a mountain!" The caption reveals the context: "Things have gotten uncomfortable since Superman insisted on being called SuperGod."
Superman, the iconic superhero, has apparently demanded an upgrade in title from "Superman" (already a grandiose name meaning "above man") to "SuperGod," and is pressuring ordinary people to use the new name.
The Humor
The comic works on multiple levels. On the surface, it is funny to imagine Superman -- a beloved, humble hero -- becoming an egomaniac who demands to be called "SuperGod" and bullying elderly people into compliance. The argument between the couple parodies real-world debates about language changes and whether adopting new terminology is a reasonable evolution or a "slippery slope." Agnes's refusal and the counterargument about "recognition of a mountain" satirize how language debates often become heated far beyond their apparent stakes. The underlying absurdity is that Superman's name was always hyperbolic to begin with -- he was already calling himself "super man" -- so the escalation to "SuperGod" is just the logical next step of unchecked titular inflation.