It's a spin-off from the Geico car insurance "Caveman" commercials. If you live in the U.S., unless it's under a rock, you've had to have seen at least one of them. If you're elsewher, YouTube it. Pretty funny for commercials.
"Geico.com So easy even a caveman could do it!" Then a cro-magnon caveman looking guy in modern dress-casual clothing working off to the side of the commercial set gets pissed and walks off. Then the next ad is Geico executives meeting with a handful of pissed-off cavemen to apologize. By now the cavemen are well branded, and are showing up in situations outside the initial "caveman racisim"… like one's therapists office, then a house party at a swank apartment complex...
I have not seen the show, and don't plan to. I can't possibly fathom how the concept could possibly be made funny in any format longer than 30 seconds...