I thought that the cutting edge sarcasm as a teaching method died a death in the late 90s for teachers.
Learning where meat comes from has a clear purpose. HG is a young adult novel without vividly described graphic violence or disturbing torture.
It’s like bringing in Carrie as a class text and then sneerily declaring that if the kids are upset by it then they will be upset by the Holocaust. Yes, parts of history and English are always going to have violent and sometimes sexual overtones. So when teaching to a whole class, just bear in mind some might well be upset by it.
Would a short story about the torture and killing of a cat upset some children? I think there’s a fair chance of that, so choose something else. It’s really not that hard.