The important part is the difference between believing someone is telling the truth despite the fact that the story might be farfetched, and actually calling someone a liar based on nothing but what you think is improbable or impossible, basically a hunch. Benefit of the doubt being thin or not, if this was "real life" and not the internet, a mature adult would have to have some sort of proof, weak or not, to actually call someone a liar. Otherwise, you're just running your mouth. Hence the expressions "prove it," or "put up or shut up."
No proof is required to simply believe someone is telling the truth, unless they have a history of lying. Again, he may be lying, I don't know. But that is scant little proof to publicly call someone a liar, in my book. So put up or shut up. That would mean proof.
Sam :thumbup: