Koreans play games a lot. Koreans also love Starcraft.

Not surprisingly, there are a lot of really, really good Korean Starcraft players, and they all fight between themselves, honing their skills even higher. Sometimes they take a break, of course, and that's how you meet one of them on US servers, like a NBA player having fun on the school yard.

Also, GG no re kthxbye means:

GG = Good game;

No re = No retry /  no rematch;

kthxbye = Ok, thank, bye.