What do you count as 'flame'?

I just told someone "Bro if you lose your chill you lose the game" to someone flaming and tilting. He then proceeded to say I was flaming and bullying and ragequited. I swear that Ranked games are less toxic than Normal games. Anywho, what do you count as flaming? Anything that makes people defensive, or spewing disgusting insults on people?
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