I love this show! I feel it has some great social commentary here and that is a key reason why I continue to watch it.
After watching the first episode, I thought it was rather racy (not racist) and was hesitant to watch much more. But it was funny enough to make me want to watch another episode.
It does get a bit racy, but that's part of the main concept I think, and I think the world isn't perfect yet on that issue so it can be a good thing. I've noticed how when a point about racism against cavemen is made you can often see a quick shot of a black person in the background which is pretty cheesy, but oh well, the point they're trying to make has the best of intentions and I can live with that subtle cheesiness.