Yes, there are cases when the person is not aware and/or lying about their feelings. Hence the qualifier " in the absence of objective, verifiable evidence". I would take a child who has not learned what "feeling tired" is yet to fit under that category, and a poster with a history of lying.

But, for the most part, in an argument, especially one online, it is not conducive to argue whether or not someone feels what they claim they feel. Take it as a given that they really do feel what they feel, and get on with the important part of the discussion, which is whether or not the action that made them feel what they feel really happened or not. Did Patty actually attack Jane? Did Judy really predict her niece's teen pregnancy in a dream? Did Stan really get abducted by aliens? I'm sure they FEEL attacked/psychic/frightened by aliens, but did it *happen*?