Who is saying the believe him? Believe him about what? He was a small boy when he started training with Chan Tai San? that is what his website says, but I don't think anyone believes that, it's already been established that he only met Chan Tai San in early 1990.
In this case, a good ol Gong Sau won't do anything other than prove who can win a fight at that very moment. It still doesn't prove he's not a liar and a fraud. That's what I want to prove here. His threats against me are just his way of dealing...since he can't face a single issue.