Well, I think it's got to do sth with someone being stuck in the middle of the success-hierarchy. They want to rise up, but can't, due to lack of whatever (talent? hard work? etc) so they blow off frustration with these psycho games. I see that often
but not these mean ugly sub-wars on boards... childish stuff
in english or american forums. There, the trolls (if there are any) are more clearer to spot like "you are a dumbass!"
"tss.. nice try, mister 'wanna be (insert pro musician,coder,graphician,designer,producer,whatever name here)', hehe. Hard to explain. It's subtext between the lines, but it leads 99% to heated debates. Popcorn material to read, sure. But I don't read that
But instead of saying "nice work, keep it up! here's some advice, constructive criticism" the replyers often try to belittle the others. It's a German thing? hm
It's always this subltle. "pf, nice try. but if you weren't an amateur, your result would be better" (Just reading stuff, it's not about me)