In the Wikipedia article, whataboutism is defined as a tu quoque fallacy, yet later on it is said that the accusation itself is a form of tu quoque fallacy. How so?
Christian Christensen, Professor of Journalism in Stockholm, argues that the accusation of whataboutism is itself a form of tu quoque fallacy, as it dismisses criticisms of one's own behavior to focus instead on the actions of another, thus creating a double standard. Those who use whataboutism are not necessarily engaging in an empty or cynical deflection of responsibility: whataboutism can be a useful tool to expose contradictions, double standards, and hypocrisy.
I have an issue with the claim, because it is said: it's an attempt to discredit an opponent's position by charging them with hypocrisy without directly refuting or disproving their argument. If you accuse someone of whataboutism, do you really discredit him of being a hypocrite? It might be a fallacy, but I don't think accusing someone of whataboutism if a form of tu quoque fallacy. What do you think? Can you give a simple example?