Sentence:  And who could forget those ads that featured sophisticated <WSD>cavemen</WSD> who were insulted—in a parody on political correctness—by “insensitive” offenders who implied that some action was “so easy, a <WSD>caveman</WSD> could do it.” 
Meaning of the word marked with <WSD> tags:  An early human or closely related species, popularly held to reside in caves.