It's Pre-Season, Take It Easy Folks
Pre-Season does not make the Blame Game OK.
Every single game I have played today has had at least 2 members on my team completely flip out at anything they conceive as anything less than LC$ material. This is the pre-season and with it comes change, the most change we have ever seen in fact and with that change you can expect some theory crafting to go horribly wrong and that is what people fail to understand. If someone on your team is playing poorly due to their rune choices, you need to step back and look at it from an objective point of view. Your emotions do not play into that matter AT ALL because in the end you will not be an enjoyable player to be around. This isn't to say you can't offer constructive criticism (everyone needs it with the runes rework) or point out an obviously bad play, but don't belittle someone for it. On the other side, if the runes you decided to take turn out to not work favorably that does not give you an excuse to vent whatever displeasure you are experiencing on others, especially those who are playing well. I was really hoping the community would come together a little more with this patch and try to figure out how to make the best out of all of this, but in the end people are letting their emotions get the best of them and making this entire balance fiesta completely unenjoyable.
Sincerely, Someone who got spam pinged by a 3 man premade, while spamming chat with "You are a snowflake" in my last game.
Side Note: Regardless of political opinion, calling someone a snowflake makes you a snowflake because all a snowflake is is a whiny, salty, ungrateful, complaining ass hole. Most hypocritical political word ever spoken.
TL;DR Try not to let your emotions best you and make it hard to play with you. The community should be coming together instead of pushing each other away. Calling someone a snowflake makes you a snowflake.