Because they just spout the nonsense they've been told to believe... when you actually link them facts, literature, quotes of the purveyors of CRT, and actual documentation... all they are left with is random ramblings and name calling.
Their egos can not handle the dawning realization that they are in fact racists... they have thought for so long they were the "enlightened", that their minds are fighting with every incoherent thought it can muster to try and maintain that façade for their own sanity.
As I said, they're racists without knowing they've been turned into racists. That would fuck anyone's mind up when they finally realize what they've become.