Juan Gamer's Law

Juan Gamer's Law dictates that if someone responds to a claim by saying it is a logical fallacy, it means they no longer can defend their position and they have lost the argument.
Saying that a claim is a logical fallacy as way to easily disprove it is a way to avoid the issue without actually having to refute it.
For example, if someone says that your claim is an ad hominem, you then try to prove that you are not using an ad hominem rather than try to defend your original point. It's a subtle way to switch goalposts during an argument and way to get stuck in a loop of trying to figure out the claim was a logical fallacy.