Knucklefist, you're completely ignoring what Eleshakai is trying to tell you. You are responsible only for your behavior. You don't 'coddle' or 'kiss-ass' in games, but that doesn't mean acting like a jerk if someone isn't playing well. Why do you equate 'expressing yourself' with harassing your teammates? You can express yourself by yelling at the computer or pounding a pillow or something and guess what? You won't get in trouble for it.
If someone else is being a jerk, how does responding in kind help anything? Instead of one person making the game unpleasent, there are two. Instead of one person risking full access to their account, there are two.
My advice? Instead of watching for every little thing your teammates do wrong, try watching for what they do right. Say thank you when the Jungler comes in to gank or if the Support sacrifices themself to let you escape and deny the enemy the gold from ending your kill streak. Tell your ADC good job when they knock down a tower or the Assassin who takes down that fleeing enemy before he can escape.
Be the better person. It's not that hard.