I think when we say that as atheists, that it's possible to believe in other "supernatural" things while not believing in a god, comes down to a response to theists.
Often times we're hit with, "Oh, you're an atheist, so you don't believe in <insert concept here> either."
It's just a response to show that aliens, ghosts, dragons, whatever, etc, has nothing to do with atheism. Atheism means you don't believe in a deity, nothing more. This is just to prevent them from adding more meaning to the word that isn't there.
Often times we're hit with, "Oh, you're an atheist, so you don't believe in <insert concept here> either."
It's just a response to show that aliens, ghosts, dragons, whatever, etc, has nothing to do with atheism. Atheism means you don't believe in a deity, nothing more. This is just to prevent them from adding more meaning to the word that isn't there.