Someone doing poorly does not magically exaggerate their speech to report worthy levels.
I just had a game of GP top lane where i did very poorly.
I got camped early game and after getting 2 kills my lane opponent was able to 1 shot me under my own turret, I ended the game 0/5/0.
After hitting this mark, our blitzcrank said in all chat "report GP for toxic racism", our midlaner claimed that the enemies should do this as well.
I said only a few sentences this game, the only thing i could even think of that could be misinterpreted as that was at the beggining where i stated a preference for english muffins.
They were perfectly fine with this at the time, but when i started feeding my lane, suddenly it was toxic racism. Even at the end of the game my team cursed at me again. I wasn't even the largest feeder at the time, our jinx was 0/8/0, and our blitzcrank (who was the one who flamed me the most) was feeding even harder.