A Vegan, an Atheist, and a Feminist walk into a restaurant, which one do you hear first? The Vegan saying everything they won't have.
Why are you saying this about people who are vegetarians?
Because they're so negative. They only care about themselves and want everyone to know what they eat.
You can't say such things about such a large demographic group. They are made up of people from all walks of life so it's wrong to label them all as such.
It's not only me saying it, their stereotype is well known.
It's impossible to generalize one vegetarian's behavior as defining all vegetarians everywhere. You might have had a bad experience with one and are now jaded by that encounter. Don't be so quick to judge them in the future.