I don't see how being vegan correlates to "retarded" or having no idea to how the world works. They don't eat meat because of the way the animals are treated. This is not in the ancient times were famine could easily happen without eating meat. This is the modern world. So your comment makes no sense and you are making yourself look "retarded" by making it.
Vegans are basically retarded and have no cognitive idea of how the world around them actually works.