Godwin's Law states that "the longer a heated Internet discussion goes on for, the more likely it is that someone will compare their opponent(s) to Hitler, the Nazis, or Nazi Germany in general."
Anyone who invokes Godwin's Law in an argument is said to automatically lose by default, even if it is perfectly reasonable; because if you resort to comparing your opponent to arguably the most evil dictator in the world obviously implies that A) You know you're wrong, B) You've run out of ideas, and C) You're a sore loser and want to make your opponent look bad, even though it does the exact opposite.
The only (incredibly rare) exception is if the person is legitimately comparable to him (for example, if they are massively racist, especially anti-Semitic, for no discernible reason), but even then it usually still has the same result.
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Assertion: vegetarianism is the best.
Reverse Godwin's Law response: Hitler was a vegetarian allegedly.
Assertion: Biden/Trump love sweets (which must be good).
Reverse Godwin's Law response: Hitler loved sweets according to Volker Ullrich