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I think if you called any race that dwelled underground cavemen then you probably would be found lacking creativity. At least 3 races are often found living beneath the surface so to call them all the same thing makes little sense given the clear racial differences.
My character would probably be angry at you for lumping my race (which clearly is superior) with any of the others that live underground in so general a sense. But in general, I think they would just laugh at you (unless they were a hellion, then they would just slay you where you stood).