People's attitudes in regard to accusations of racism aren't new; they're just put into academic language which gives the old go-to that's used by people who are losing an argument some credibility.
Basically, it's witch dunking.
For those who don't know history particularly well, it was common practice too use a cucking stool as a form of punishment to embarrass people for centuries. When it came to accused witches, they were usually dunked until they confessed or they drowned.
So, as I said, this isn't anything new. Calling a person "racist" has been the go-to tactic for idiots for as long as I can remember. Saying that you have black friends just makes you more racist. Pointing out that you have a black girlfriend makes you more racist than that. You could have a few interracial kids and that just means that you're taking all the effort in the world to prove that you're not racist. Or, you can confess and apologize; and then your accuser gets to dangle that confession over your head forever.
There's one response to accusations of racism - "Fuck you."