No matter how much he has been through, it doesn't give him any right to bully another. He can find some other way to deal with it. He brought this so called "stress" upon himself by not thinking twice about those comments he posted. This whole comment war is due to his stupidity, which I hope was just momentary.
The fact that you are mocking me and thinking its funny leads me to believe you too are immature. Don't take this any further, there is no use defending your friend. What he did was called Cyber Bullying, and that is a hate crime. Next time either of you two do it, I will definitely report both of you.