Can you give some specific examples?
That seems like an over correction to me and I think that it shows in the push to tear down monuments of great people in American history who were largely products of their time.
For example, it's hard to overstate how important it was that George Washington gave up the presidency. He set the stage for the peaceful transition of power in the US and even the world. But he also was a rich guy who owned slaves.
It's not nuance that's missing, it's the concept of duality.
I don't know that it's not being taught but the attitude seems to be that a person who owned slaves shouldn't have their accomplishments and contributions acknowledged or that those contributions are taken for granted.