Wasn't arguing that his time wasn't scarce, that he shouldn't be paid, or that the "teenager" was the one in the right. Just pointing out how their cultures misaligned and that their arguments missed each others minds most cleanly.
I wonder what the girl would have said if her boyfriend broke his promise to not publish some private photos of her, and shared these with his friends (and with others on a public website). That's obviously a gift economy but would she have found the argument convincing in such a case?