It was obvious sarcasm (laced with truth) based on prior exchanges with the guy.
Sheeeeesh.....get over it.
But for the record, I don't always disregard the opinions of those with other beliefs, no matter how much I disagree with that belief. However in the case of a true atheist, I write them off as pretty hopeless; literally and figuratively speaking.
I hope this satisfies your peculiar interest in my comment.