I don't find those farm people stupid.
And if we're going to nitpick, they weren't supposed to be "real" farm people but holographic farm people.
Actually, I said the stereotypes were stupid. And they were. Corny accents, banjos, a slutty version of Ellie Mae Clampett and, well, corn... Yee haw! Let's have a hoe-down!
Once again, it's a perfect example of using stereotypes that make it patently obvious that TPTB have never set foot on a farm.
And since Janeway supposedly grew up in farm country (even to the point where she could tell the difference between manures by smell), that's a stereotypical (and unrealistic) image they took from her brain to create the illusion.
ETA: You really don't think that the stereotype of a slutty farm girl is offensive? Stupid?