You raise a good point. I feel like my personal issue is with gnostic atheists, who proudly trumpet that since human beings cannot prove that God exists then he must not exist and any attempt to think or act otherwise is just foolishness.
I'm much more conversationally compatible with the agnostic atheists who say we can't know that God exists so most likely he does not.
To be fair, there are assholes in all four quadrants, and my actual beef is with the assholes who feel like they need to force their belief or their lack thereof on me.
I would feel the same way about a militant zoroastrian who expects me to convert to their religion as I would against a militant Gnostic atheist who expects me to abandon my own.
And I also understand that many atheists have been antagonized by militant Christians for not believing and so therefore they are primed to defend themselves against anyone that identifies with their former enemies.