Hmm. Maybe it is considered an insult after all. Or maybe that don't be stupid means don't be so trusting. Either way, Armin quiets down again and mulls it over. He doesn't know enough about the situation to take a guess. He's only just met the man after all.
eh don't worry... http://cerealia.dreamwidth.org/113878.html?thread=19226582#cmt19226582
No, the vampire. He'll have to keep that in mind.