Neko already pointed out most of what you said that was punishable in this case. Note that nobody's saying you shouldn't get angry: I get angry at my teammates all the time. The difference is that I never type out my anger to the rest of my teammates (or, like in your case, to everyone in the game sometimes). You can try to be constructive all you want, like telling jax to tower hug until a gank gets there or telling darius to hang back when he's by himself. When you start insulting people is when you start breaking the summoner's code.
If you can't say it nicely, it's best not to say it at all.