Accounting for Atheist Ethics

I saw an email come in today from an old thread on another site. An atheist attacked a bunch of stuff I said quite some time ago. He's sort of the perfect picture of why I've completely abandoned Facebook and all the online discussion stuff. It is truly pointless and can hardly be called edifying. We've reached a point in our cultural dialogue that anything longer than a few lines is too much for people to follow. It's just cyber-shouting and doing your best to insult the other person.  In other words a waste of time and something I no longer pursue.