So, whenever i'm in a game, doesn't matter if it's normal, ranked or flex. People are categorizing any behaviour that doesn't comply with one's own vision of the world as trolling.
Off meta pick = troll
Ignoring a pushed lane as a jungler = troll
Last hitting creeps as support while your adc is in base = troll
Not buying sightstone = troll
Having a poor score = troll
Roaming as Bard = troll
Having heal on cooldown as Soraka = troll
Not building ardent = troll
Dying with your ultimate on = troll
This is just my shortlist of what i see on a daily basis and what people think trolling means. Unfortunately this is one of the main issues making the report system bloated with fake reports, having the impresion Riot is trying to support trolls when in reality the only issue in that game is YOU thinking those actions are the results of a troll.
My experience for the past week, i've reported atlest 1 person 10 out of 10 games, either from my team or the enemy team, for using the chat to cry about the lines stated above and begging for unjust reports.