Insulting player cause they're bad is like yelling at a newborn cause it can't walk.
I'm pretty sure both are trying to do their best to improve.
Furthermore flaming your teammates won't result in a better outcome for your team at all. As Gull mentioned before, they get frustrated or mad, which really isn't a healthy enviroment to push them to their best.
It's a game which we play for fun, cause as far as I know there is no NW e-sports. So relax a little bit and don't get mad for a temporary bad situation, which changes completly 20mins later, after your next win.