I call Godwin.
Godwin's Law (also known as Godwin's Rule of Nazi Analogies) is a humorous observation made by Mike Godwin in 1990 which has become an Internet adage. It states: "As a Usenet discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches 1."The term Godwin's law can also refer to the tradition that whoever makes such a comparison is said to "lose" the debate.