If you are vegetarian, do not eat meat, what just mostly includes fish. Vegans do not eat any animal products at all, including, for example, eggs and milk products.

Of course you can also eat vegan, without adhering to the animal rights ideology. Presumably even the fewest vegans support the position of animal rights activists.

From an ecological point of view, it would make sense if less meat would be eaten all over the world. However, this can’t legitimize a strict vegetarianism nor a basic veganism can be justified.