[ If Faerun's demons worked together instead of at cross-purposes then the world would be a much more dangerous place, in his not-so-humble opinion. ]

They dominate each other and view strength as the only true measure of superiority. Each demon wishes to topple their rivals and fears being toppled in turn. So they occupy each other. [ He sounds downright disdainful at this. ]

Demons are different in the plane you come from, or so I would assume. [ Or he doesn't know demons at all. But he feels safe to gamble on the assumption that this man may come from a different place than he entirely. ]