Whataboutism is a highly informal term used primarily in politics to refer to a whole slew of fallacies, including ad hominem, tu quoque, argument from fallacy, and the fallacy of relative privation. It consists of bringing in thematically related events, statements, and actions to deflect attention from the central issue.
"Whataboutism: The practice of responding to an accusation or difficult question by making a counter-accusation or raising a different issue. Also in later use: the practice of raising a supposedly analogous issue in response to a perceived hypocrisy or inconsistency."
-- The Oxford English Dictionary
As this definition suggests, an accusation of whataboutism is leveled in cases where it is believed to be inappropriate; if you believe that the challenge is fair you might call it a counterexample, a counterpoint, a challenge, an analogy, or an intuition pump -- but surely nothing so…