I think it's because some animals are raised for their meat, and some not, and they're different animals in different parts of the world. Similarly, some animals are hunted or foraged for food and others aren't.

I think that kind of ...crystallises? into eating taboos. So for example, where I'm from, in Greece, it's traditional (particularly in the islands of Crete and Corfu) for people to go out and gather snails after the rain to cook them and eat them. Famously, the French also eat snails. But offer snails to an Englishman? Yeeeew! Snails!

And let's not forget that entire millions of people don't eat specific kinds of meat because it's forbidden by their religions: faithful jewish and muslim folks don't eat pig meat, Hindus don't eat cow meat (unless the cow must be put down because it broke a leg, if I understand correctly) and so on.

And then there's matters of personal preference. In Greece, organ meats are considered a delicacy, but I have at least two friends who will not touch them and will probably puke if they smell them cooking.