I think you are confused about those "tryhards." No matter if it is ranked or normal you should try to win every game, if you aren't, what's the point? To troll? To be honest, if you go into a normal game and expect to troll in it to blow off steam from the last 6 ranked games you lost, that's exactly what you are, a loser. Trying to win every game doesn't mean you play your best hero, it means you pick someone you honestly want to play, that fits the team composition and you try your best. That is all. Simple as that.