Beware of this guy

[McCohens at aol.com]

Matt Mattia recently sold me parts from his parts car.  Two days after the deal, he informed me one of the parts was on ebay and he wanted it back because it sold for 20 bucks more.
Here is his response.  Beware of doing business with him.

you are a true asshole.  i tried to be nice by giving you the ic for less than it was worth but forgot to cancel the auction.  i have many things listed and wasn't sure off hand if that ic was one of them.  i was nicely asking you to help me out to atone for a mistake.  i held these parts specifically for you for a few weeks, not posting them online. i also went out of my way to make myself available to complete this transaction, putting aside plans. all i want is fair value which your cheap ass refuses to remit.  if you want to threaten me, come back down to where i live and do it to my face.  its becuase of people like you that makes people like me into cutthroat business assholes that never give anyone a break.  i'm now sorry that i gave you one.  if $20 means that much to you; pity.  i knew you were a jerk when you belligerently refused to observe the one way sign.  i wouldn't be surprised if stealing parts off my car even crossed your mind now that you know where it is.

Its a shame people like this use the list, have others had problems with him?