I came here to post this exact same thing. The reaction to MLK Jr.' s death seemed to be at odds with the characters' portrayals thus far in the series, and basically ignored all the casual racism exhibited by employees of SCDP. Remember, these are people who laughed and cheered when Roger wore blackface and performed a literal minstrel show. And the only reason SCDP hired Dawn was because a joke backfired on them.
For a culture steeped in casual and not-so-casual racism, everyone was infused with modern sensibilities for one episode. It was really weird.