There's a basic message in your story, KK. We are all brought up with fixed ideas about what does or does not constitute "food." Sometimes they're widespread (i.e., most westerners do not think of insects as food), sometimes culture-specific, and sometimes they're just part of the group-think, whatever your group happens to be.
Then folks like Andrew Zimmerman capitalize on that, which, in turn, exaggerates the feeling. Most people, watching shows like his, do not react, "Hey, I've got to try that." Instead, they react with, "OMG. Look at what those poor blighters are eating. Ugh!"
Thus, if we are raised up to not think of snails as food we're predisposed to not want to eat them.
Perhaps the most widespread of these biases, in America, is carp. Although numerous European and Asian cultures think of carp as a great delicacy, Americans do not think of them as foodfish. The very idea of eating one is repugnant to many of us.
It can really get strange. I'm sure, for instance, that the mythical man from Mars would find it strange that the same person who gags at the thought of eating crickets has no problems with lobster.