Why is this game full of toxic people?

I've came back to the game after like what 6-7 years and decided to give it a shot again. Been playing league in the meantime since most of my friends are playing that. In every game I've played everyone is hostile and toxic like even worse than in league it's crazy and beyond me how 2 mins into the game legit barely anything happened and just full on flame between everyone.

Back then it was already bad but it's gotten to a level that's insane. How are ppl dealing with this shit?