Genetic Fallacy

The genetic fallacy is a form of Ignoratio Elenchi (fallacy of irrelevance) that consists of arguing for or against an idea based on its origin or past and not on its present merits.- Thus, for example, argumentum ad hominem (against the person) is a form of genetic fallacy, as much as appeal to respect, (Argument ad verecundiam) or to authority or (Magister dixit)

The origin of B is A A is criticizable in some way

therefore B deserves the same criticism or disqualification