What does this mean??

Gaslighting is a term often used by mental health professionals (I am not one) to describe manipulative behavior used to confuse people into thinking their reactions are so far off base that they’re crazy.

The term comes from the 1944 MGM film, Gaslight, starring Ingrid Bergman. Bergman’s husband in the film, played by Charles Boyer, wants to get his hands on her jewelry. He realizes he can accomplish this by having her certified as insane and hauled off to a mental institution. To pull off this task, he intentionally sets the gaslights in their home to flicker off and on, and every time Bergman’s character reacts to it, he tells her she’s just seeing things. In this setting, a gaslighter is someone who presents false information to alter the victim’s perception of him or herself.

Whataboutism gives a clue to its meaning in its name. It is not merely the changing of a subject (“What about the economy?”) to deflect away from an earlier subject as a political strategy; it’s essentially a reversal of accusation, arguing that an opponent is guilty of an offense just as egregious or worse than what the original party was accused of doing, however unconnected the offenses may be.

The tactic behind whataboutism has been around for a long time. Rhetoricians generally consider it to be a form of tu quoque, which means “you too” in Latin and involves charging your accuser with whatever it is you’ve just been accused of rather than refuting the truth of the accusation made against you. Tu quoque is considered to be a logical fallacy, because whether or not the original accuser is likewise guilty of an offense has no bearing on the truth value of the original accusation.

Whataboutism adds a twist to tu quoque by directing its energies into establishing an equivalence between two or more disparate actions, thereby defaming the accuser with the insinuation that their priorities are backward.