While I've noticed vegetarians being lumped in with the other two groups, I've not noticed any real (as in socially acceptable and intense) hostility toward them like the others.

I suspect a lot of that is because most vegetarians aren't actively trying to punish other people for eating meat (or at the very least, maybe because those that do are considered animal rights activists instead.)



True, but it wasn't the only one. As I recall, at least several all pointed to the same outcome.