Can I get a group opinion on a related question? Would that be appropriate?

I got into a debate with someone over falsifiability. I claimed that the falsifiability of a claim is relative to the person hearing it, and he claimed it was an intrinsic property of the claim itself.

I said that the claim "I am currently sitting on a couch" is falsifiable to my family, and potentially my neighbors, but not to a peasant in north korea. He disagreed, rather profanely and insultingly, and the debate disintegrated, because of John Gabriel's Greater Internet Fuckwad Theory. But I'd still like to know what a more level-headed and calm group of people think on the subject.