whataboutism

Attempt to deflect from valid criticism by claiming that your critic are themselves deflecting from criticism.

US Liberal: Conservatives want children to die because they won't ban all guns!
US Conservative: The vast majority of guns are never used to kill children, and are routinely used for self-defense to actually save lives, including those of children. Besides, you're pro-abortion, which literally murders millions of children every year.
US Liberal: Shutup! That's whataboutism!