I don't know if I am the only one experiencing this, but in the vast majority of my games I simply cannot say anything good about my opponent without getting flamed.
I like to be a good sport, and sometimes I really like some plays my opponent do. I might write something like: "Good job, you got me" or "nice play", or something like that. The opponent will either think I am being sarcastic or start flaming me with stuff like "noob" or whatever. Worst case scenario is when I get flamed by my own teammates for writing something nice to our opponents.
I know this is a competitive game and people tend to be aggressive, but I am curious to know if this kind of behaviour is common.