You can discuss the events of a story, and the relative morality and social etiquette of the characters in it, even if the whole thing is entirely fiction. Functionally, it makes no difference if it really happened or it didn’t. Sometimes that matters, but here is doesn’t. You don’t know these people, you’ll never meet these people, and there’s no real-world effect of discussing this story (except maybe someone learns not to touch somebody else’s food?).

Fuck it, you could be a bot programmed to complain about people taking shitposts seriously. I could be an AI created to respond to your prompts to try to convince you not to complain about fabricated stories. This entire interaction could be four bots engaged in a learning exercise in a simulated online forum. Or maybe it was all a dream the whole time.