It's quite possible that you know far more vegans than those 2 people. Again, most vegans don't comment on what other people eat, explain their dietary choices, or rant about issues surrounding food. There are probably people you know who you don't know are vegan; they don't come with special identifying marks or introduce themselves as "Hi, I'm Sue and I'm a vegan." For example, I work with a large group of people and only a very small number know I'm vegan. Even people I've had meals with don't always know.Yeah I think it's fair to say that. It was a really extreme example and I think most people vegan or not don't feel that way about the cow thing...
But I will say that in my limited experience with vegans (like 2 people, really) they were really horrible to anyone they met that ate meat. They would go on and on about how we were murderers and scum just for eating meat, and it just made it really hard to take them seriously when they would use outrageous examples (like the cow thing, not the first time I've heard that, heard it from the few vegans I met) but the people here make some pretty good points.