It's crap like this that makes me glad I'm not playing regularly with you guys. Taking things too seriously leads to fatigue leads to anger and a lack of desire to play any longer.
I quit playing dota cause of in-game blame game shit. I had to ask myself whether playing dota was more important than retaining a good friendship, which of course wasn't the case. Since switching over to The Shizz I've enjoyed the game a million times over, even in losses. I guess that's because of camaraderie though.
If you want to be super serious about everything, especially in a non-scrim, non-league game, let everyone know that ahead of time. Then if things don't go your way, you know to look over the game and take from it what you can to improve and better compete the next time. If you want to be super serious when people just want to relax and play some co-op video games (albeit ones that require a bit of concentration and active thinking & hand/eye coordination) then you're in the wrong place.