Ah, the irony. The guy who misidentifies someone else gets ruffled when he's called something he doesn't prefer himself. While Ferroc isn't petty enough to focus on that, he does give Kaiba a weird look at the mention of the word.

Then starts laughing. Slapping his knee and everything.

"Yeah right," he finally just says and continues devouring his dinner. The human had clearly never met dragonspawn, although it was worrying that he seemed to want to associate with it. That's how Sons of Svanir usually started off, wasn't it? Perhaps it's a cause for concern. "How are you so certain we all died?"

He still has doubts. It's not unreasonable to think that it did happen, but he's also not seeing any solid proof for it, and he definitely does not like the thought that human gods may have some sort of power over his soul.