Yeah no doubt about it, league of legends is definitely the most toxic game I've ever played, and there is actually no other game community that can match the amount of toxicity that this game has.
I'm not saying that csgo doesn't have toxic players etc, i just don't meet a lot of them while playing at the highest rank in comp etc. But im sure when you playing the lowest ranks etc, it'll probably be fairly equal to the aidsinfested league system.. Low elo, elo hell etc.