Personally for me, I had a run in with two extremely toxic players today (I'm at the point where I truly believe that the ingame League community is much worse than the Call of Duty community in every single aspect now, seeing as I run into toxic players every single time I play League, vs running into a toxic player in Call of Duty every 3-4 games or so), and both have said some pretty bad things; things such as:
- "You're retarded"
- "Uninstall you dumbass"
- "kys" (Kill yourself)
-"Stop being a fucking autist"
Just to name the more toxic ones they mentioned, and this was on an ARAM. I know how you feel, and my next games after the ARAM today do show how negative attitudes of others can affect someone in future games. I personally am at that point where I refuse to go into Ranked as a solo player now because I can't tolerate how bad the ingame community of League has become since I joined. When I joined back in late 2011, the community was toxic, but it was definitely not as toxic as the community now.
A lot of people do complain to Riot though about the toxicity, since many believe that Riot has not done a decent job at making their community more inclusive (For example, people are still freely able to call each other racial slurs, homophobic names, able to make fun of someone with a disability, etc.), and as well as not really listening or even being empathetic to a person (This lack of empathy is pretty much in the form of automated responses in Support Tickets, which many people think Riot uses for answering).
I feel you, and I know I heavy tilt when people call me retarded in the game, seeing as I definitely take that offense as one of the worst things someone can say to me, even in real life. I'm not mentally or physically disabled, but I do have family members who are due to injuries as well as genetics.
My account is at that point where my reports mean nothing, so if I reported someone who did break the rules by being extremely toxic, chances are, they will get away scot-free unless someone decides to report them for being toxic.
Sorry about your negative experience though. I would definitely recommend playing with friends in Ranked (even though the naysayers and toxic players in this community, both ingame and in the forums, will say that you're boosted. Personally for me at this point, I would rather be boosted and play with friends who I know I will have a good time playing with rather than playing solo and constantly having to deal with the toxic ingame community.