What's sad is I used to be exactly like that when I was an atheist and in the beginning walk of my relationship with Christ. What he did was completely wrong and could have potentially hurt some feelings (from what I'm seeing, it didn't phase anyone and for that, I am so thankful.) Because I once was like him, I had no one liking me. I had no one wanting to be around me. Because I hated people and I hated myself.
My heart breaks for that guy, because it seems like there has been no encounter of Christ. And it is indeed a sad life to live and to lead. It wasn't until God appeared to me, slapped by on the side of the head, and led me to healing. Within just a couple of years of life transformation, I became very likable because I started genuinely loving people because I felt God's love. I have a desire to see him encounter Jesus in such a way that he can't go back. I know he came off as a jerk, I know that he was completely in the wrong....but now our duty is to pray that he encounters Jesus in such a way, in such a deeper way, than he has before.