Yea, I've noticed this trend among lots of people. I feel like right now is the beginning of the end for league. It'll still have a big enough playerbase to continue on for 3+ years, but I think it will stop growing it's player base from now on.
After my post above, I patched and played an ARAM. I get in game (I was master yi btw), our zilean seems to be haphazardly throwing bombs on our own minions. He's not harassing with them, he's not doing the combo to try and land 2 on the same person, etc.. I suggest he just Q,W,Q on the same spot for the stun, he then does it 10 seconds later and we get some good harass off his stun,
'nice!' I say
'stfu' - him
'I wasn't being sarcastic'
'neither was I'
'you weren't stunning anyone, that time you did.'
'it's an aram, relax. This yi so salty'
'ok wow. It looked like you hadn't ever played zilean, was simply trying to help.'
We come back a little bit, I hit a power spike and get a quadra, but then our team keeps focusing their tanks and they learn to focus me if I try to take out their kalista that was wrecking us, so lose. Normally, I'd try to point this out so we stop doing exactly what the other team wants, but I just didn't even want to after that first exchange. After the game, I promptly logged out and played some hearthstone instead.
People are shitheads in general in most video games, but the way league is designed specifically pushes people to be extra asshole-ish. If you want to work together, you are tryharding. If you die, you are a scrub. If you have a good score, you are KSing or not helping the rest of your team enough. No matter what you do or don't do, someone will be an asshole to you about it at some point in league. We put up with it for a long time because the game was so much fun on it's own, but it's become played out now.