What it is: Vegans do not consume any animal products, so staples of a vegetarian diet, like eggs, dairy, and other animal-derived foods, like honey, are off limits. Dietary veganism is often practiced in conjunction with what's known as "ethical veganism," which excludes the use of animal or animal-derived products like leather or personal care products that are made using glycerin or lanolin.
Why it's annoying: Veganism is equally a dietary and political choice, and adherents believe strongly in their ethical superiority. They will make sure you know it, too.
Key catchphrase: "Bee enslavement."
What it is: Raw foodies, also known as raw vegans, consume uncooked and unprocessed foods. There are several different approaches to a raw food diet -- the biggest of which is that some raw fooders only eat plant-based foods, while others include dairy, eggs, meat, and fish. Either way, the rule is that your food can't be heated above 118 degrees Fahrenheit.
Why it's annoying: Raw foodies combine all of the sanctimony of veganism with some powerful flatulence. Need we say more?
Key catchphrase: "I'm considering going full sproutatarian."