*My suspicion is that part of the reason people have such negative stereotypes about chickens and other farm animals is a deliberate campaign of misinformation by corporations such as Tyson, who do not want you to question their business ethics. I would love to hear what other people think about this, maybe I should start my own thread? I tried to search to see if this has already been discussed on here, apparently everyone likes to name their chickens Tyson.
I personally don't think it has anything to do with Tyson, and everything to do with old adages: "Dumb Cluck", "Chickening Out", "Chicken Little (The Sky is Falling!)". You have a bunch of very old stereotypes about chickens that are all negative (and were probably around before Tyson was even a big company). These stereotypes probably came around from small-time farmers who viewed chickens solely as expendable livestock and not pets. The farmers were only interacted with their free-ranging chickens long enough to throw table scraps at them and collect eggs, so they didn't really understand their behaviors well.
Also, chickens can be STUBBORN, and people will mistake stubbornness for stupidity.
Just my two cents.