Fight Club and the countless movies like it, which are character-driven and the character is driven by extremely maladjusted desires and behaviors.
“Alright, but isn’t that being ableist in Fight Club’s case?”
No, if both of the alters acted like normal people, you’d just have an especially weird buddy comedy with none of the conflict of the original movie.
It’s an understandable mistake regardless, but just for your reference, the “What is your story?” at the end informally indicates it only wants affirmative answers because that’s how you’d have a “story” to tell in this regard. There are often hints like that in a question like this.