The concept of "good faith" is a self-refuting one, as it has no real definition. It's just an sophisticated sounding ad-hominem that means "I don't think this

The concept of "good faith" is a self-refuting one, as it has no real definition. It's just an sophisticated sounding ad-hominem that means "I don't think this person really believes what they say" but is invariably made without any proof, as it's the sort of unfalsifiable she's-a-witch claim that cannot be proven one way or another.