There's an episode where they find a huge underwater pyramid that has ancient Greek writing on it. A character gets possessed and starts speaking Greek. It turns out it's The Temple of Minerva built by Neptune. Now if you had a thing for mythology, like I did, as a kid you probably notice those are the Roman names of the gods. And Minerva is a black woman. This is in the early 90s.
This "replacement rot" has been going on for a long time
I would still say the occasional “racism is bad” using the standard definition isn’t anywhere near endless lectures about how bad white ppl are. I remember a few Different World episodes where black characters were called out for their anti white racism. One episode the character asked why he needed to learn European history and the professor gave a good explanation. Definitely wouldn’t see that today