So did I. The black student she interviewed set a commendable example by declining to express hatred for the whites involved, though he hated what they did. The question you suggest would have been valid, but that kid would have likely answered it appropriately.
I have never heard any “journalist” pose this question to a black person concerned about white racism:
“When would it be appropriate for you, as a black person, to label another black person as racist?”
Racism is a one-way-street. Freedom of speech is non-applicable under any circumstances. It’s not right.