I've been talking to this vegan guy recently, and I also dated a vegetarian not too long ago. But frankly, it's too inconvenient. I may feel that way because I already have food allergies that severely limit my diet (corn and egg whites), so when going out with friends and there's already only 3 options on the menu, two of them are bound to have meat.
That being said, these guys may have had a bit of an influence on me. Right now I'm eating leftover stir fry from last night, completely vegan. So I'm not against it, and I eat vegetarian when I can, but I can't sustain it all the time.
Plus, I love milk. And cheese, and ice cream, and yogurt... Milk products have saved my butt too many times when I needed something quick to eat. I can't give that up.
I guess I should also add that I buy my milk, meat, produce, and just about anything else I can locally. I'm not a 100% localvore, but I make a significant effort. I've been to a lot of these farms, and I know the animals are treated well.