Atheist: "I'm an atheist."
Me: "Most atheists are agnostic and not atheist."
Atheist: "I'm not agnostic, I'm an atheist."
Me: "So you would believe god exists if it was proven."
Atheist: "Yes."
Me: "Then you're an agnostic."
Atheist: "DON'T PUSH YOUR EVANGELISTIC DOGMA ON ME YOU (insert basic freudian reference insult)
Me: "I always wondered why someone so concerned with scientific specifics has such trouble with semantics."
Atheist: "[Fuck you!]"

Moral of the story... don't be a fucking poser.