Blocking helps. I find it mind-numbingly hard to understand why people even bother talking to these people. Isn't it obvious they have far more experience being a jerk than you ever will?
Consider the facts.
So just ignore taunts/insults and stop letting them show you their vast repertoire.
Block, Block and Block!
Sure thing, he blocking me says more about him than about me blocking him.
Remind me of a saying:
"Don't argue with an idiot,he will drag you down to his level and beat you with experience" 
youre right, why even bother, he must be a kid or a retard.
I think this will apply:
http://www.goodreads.com/quotes/539027-never-argue-with-stupid-people-they-will-drag-you-down
Well I had a game today and it is was no fun at all. He did a move checking me with his queen but that square was covered. So it was a mistake from his side. He started about "You ar not that good" "I showed mercy" And some other sore stuff like that, a lot of people are getting and giving this, (including myself) no big deal, but this guy was extreme.
I just responded just with: "lol" and "rofl". Than he started cursing and saying things about my mother. He was giving me no opportunity to respons, because he blocked the chat. Than he didnt resign but waited till hes time run out and disconnected and blocked me as member so could not leave a note or sending a message.
He must be very lonely, thinks he is ugly, feeling bad, having no friends or girlfriend, problems etc. No self esteem, he is hiding behind his computer with anonymity saying thinks like that. He wants to be tough but its pathetic, but its his problem not mine.
Normaly i dont go so far on this kind of stuff, but this time it was a little frustrating, because he was running away, and i could not theach him a lesson.