Some highly ethical people feel that it's wrong to kill and eat animals.
If you eat meat, try not to antagonize them. They don't need it and you don't need it.
If you don't eat meat, try to have compassion for those who do. Omnivorous Greens are doing the best they can, and they are your allies on many issues. They will stop when they are ready, and it's a good thing for them to see you being the kind of person they want to become.