Oh, and a few more:
"Oooh, so you're vegan? But you can eat fish, right?" - Riiiiight, because fish is a vegetable..
"WHAAAAT, how do you NOT consume any milk or cheese at all? I'd die the second day."
"Humans are born predators!"
"But you know that if we don't kill animals, animals will turn against us and kill us!"
"How do you get iron/protein in your body!! You can't get that much protein from eating vegetables!"
And the most annoying of all: "So what if you're vegan? It's not like you're going to stop people from killing and eating animals."