system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the “Fallacy Fallacy”.
gpt
It is the mistaken belief that pointing out a logical falacy in the argument means that the conclusion that argument presents is untrue.

In formal logic, one must put forward sound arguments - arguments where the conclusion flows from the premises, and where all of the premises are true - in order to 'prove' their conclusion correct.  A logical fallacy is when the conclusion does not flow from the premises.  So, for example, saying that something is true because everyone believes it to be so it the appeal to popularity fallacy - common acceptance does not prove something true or false.

However, just because something hasn't been proven true doesn't mean that it has been proven false.  A popular belief may very well be true - it just hasn't been proven to be true just because it is popular.  The fallacy fallacy mistakenly concludes that because and argument is invalid that it is false.