That was the biggest thing I hated about dota was people that would freak out and start ranting about either the player sucking or just dumb stuff like host you suck. My favorite is when you create a noob game and those same people tell you you suck and your like "omg its a noob game, cant you read?"
I dont think the demigod community will ever get that bad. I have been playing dota for nearly 5 years and pretty much stopped playing online with people I do not know (thank god for ai maps) because too many retards that talk crap, even if when they themselves are not that good. I had one game where I was harrased the entire game and his kill to death ratio was terrible. Why are people so annoying like that, its just a game get over it.
I would love if they made an ignore list or something like you mentioned Annatar11 so people who just want to play and have fun dont need to be remined of the elitist/nerdrage/emo kid that has more issues than just playing demigod in a rational way.