He publicly disavowed Ralph on Twitter back in 2021. Karson might have flown under the radar, but that sure as hell didn't. He even used the word:
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This was in response to Ralph becoming hyper belligerent over the shart. It also stuck until Dick cajoled the two into making up.
Nick is not
completely above disavowing people. It's just that conditions for him to do it are such that such cases will be extremely rare. Namely, he seems to reserve a disavowal for those who massively piss him off somehow, and where he feels getting something out of the person is no longer in the cards. As a practical application of this, I don't think Nick will ever disavow Masterson as long as Masterson continues to pretend he's Nick's friend.
Interestingly, I don't think Nick would ice Karson today. In fact, given he's Vito's friend, it would not shock me in the slightest if he makes up with Karson just like he made up with Ralph. Nick's view of pedos and groomers is now very weird and different from what it once was.
Imagining buddying up to somebody that Destiny doesn't want to have anything to do with.
EDIT: Typo.