Looking at your matchup with him, it appears to be a case of a sore loser/bruised ego. Not sure what - if anything - went on in the chat during the games, but that would be my first guess.
What is exactly the point of being unpolite?

Avg. Opp.: 1211:))! Just running Coward:)! Lol
by I_c_h_i 15 minutes ago
Posted on another member's wall, to whom he had also lost 2 of 2 games. Definitely seems to be case of a bruised ego. Or maybe this member is just a rude person in general and taunts those whom he defeats as well. Who knows?
What exactly is the point of being polite?
I had one player offer me a draw when he had a lost position. I said no, so he claimed he had a right to let his clock run down. I said fine, I've got a book to read. I actually did read the Battle Cry of Freedom until his time ran out. I even responded politely to his question about my race, given that I was reading a book about the American Civil War the question made sense, however my reason for not repeating the question should be clear.
How hard is it to ignore unacceptable behavior?
Matecia is just Coward:)! Lol
by I_c_h_i 15 minutes ago