What is toxic and no

what is considered toxic or not? is toxicity when you flame a teammate only? i just said that riot are retarded and their balance is awful compared to other mobas and got reported for toxicity by a couple of people (at least I think so they said so at least) even though i didn't actually insult or hurt anyones feelings. does that make me toxic? what is toxic? what is life? sorry i mean me too thanks.