The fallacy fallacy

Just because an argument contains a logical fallacy doesn’t mean the argument is necessarily incorrect.

An example:

Person A: This food is better for you because it’s all natural

Person B: appeal to nature, therefore you’re wrong and it’s not better for you

The food may well be much better for you but person B has assumed that the opposite is true because person A has used a logical fallacy and has themselves fallen into a logical fallacy.