Recrimination
In law, recrimination is a defense in an action for divorce in which the accused party makes a similar accusation against the plaintiff. In plain English, it is a lawyer's way of saying "You too."
Recrimination was generally considered by family law experts to be one of the most dysfunctional and illogical aspects of the old fault-based divorce system in common law countries. For example, in the context of a marriage where the marital relationship has collapsed to the point that both spouses are openly committing adultery, the assertion by either spouse of this defense would prevent a divorce even though the family unit is clearly no longer capable of functioning.