Rules User going crazy after bad deal

Hello,

I took this job from this guy for a wordpress theme but was not able to finish it on time. It got delayed by me for around 36 hours and he got upset rightly so. So he gave me a bad itrader which is ok since it was my fault.

About this job I never took any money from him, and i tried chatting with him explaining and apologizing but he keeps saying he's going to sue me and stuff and that he spend 400k on this project marketing and what not and that i have made him very big loss.

I don't have a problem with that, but now he keeps posting in every post i Post to. Check

http://forums.digitalpoint.com/showthread.php?p=12629349#post12629349
http://forums.digitalpoint.com/showthread.php?p=12620206#post12620206

and makes new posts regarding this
http://forums.digitalpoint.com/showthread.php?p=12629654#post12629654
http://forums.digitalpoint.com/showthread.php?t=1523672 ( deleted )

and so on. The problem is he is checking my friends and posting on there threads too. If he's just posting regarding me that's fine but he keeps posting on some of my friends posts and that's not good.

Can anything be done ? He has already given me 2 bad Itrader ( One for a all tweak tip i gave him in July again delayed but i told him that it will be, didn't charge )