Chicken is chicken is chicken

Last Monday was the first day of my Calculations & Dosages class. We started off with an introduction; name, major, if we had kids, etc. A lot of people were listing their animals, so I decided I was going to be cheeky.

"Hello. I'm Ket. I'm majoring in veterinary. I have one little girl. Four dogs. Oh, yeah, and 95 chickens."

The class paused. My teacher peered at me. "95?" She asked. I nodded. Class resumed.
Later on, the instructor was going over the class rules.
"I don't care if you eat a bag of chips or a candy bar," She mentioned. "But if you bring in steak and potatoes, you'd better bring enough for all!"
Me being my cheeky self, I piped up. "I can bring in roast chicken!"

One of the girls sitting down the row squeaked. "Wait." She said. "You actually eat your chickens!?"
I kinda gave her A Look. "Well, yeah." I said, wanting sorely to add (and what else would we do with 95 chickens?).
Her face took on a horrified look. "You mean you slaughter them?"
"Uh... yeah." I said, peering at her. She gagged, but by now I was curious. "Are you a vegetarian?"
"Well, no." She said with a valley-girl twang.
Confused, I asked "So... you eat chicken?"
With a teenage-girl e yeroll, she goes: "Yeah... but it comes from the store!"

I waited a moment to see if that statement would click in her head. Meanwhile, our teacher is looking between us with a pained, I'm-trying-not-to-laugh look on her face. The class was silent.
After a minute, I realized that this girl just didn't get that chicken = chicken... whether it's from the store or in your backyard. Either way, the bird dies...
"Yeah." I said, and turned back to the front of the class and opened my book.


Now, this isn't the first time this has happened. I got a similar response when I mentioned in a chat room online that I slaughtered chickens. "Well, yeah I eat chicken, but it comes from the store!" It seems to be... well... a pretty common response. Despite the lack of sense of it.

Next time, I'm going to reply with "Yeah, and someone slaughtered that store chicken too, I bet!" all cheery and smiley-faced.