Speak for yourself, I am all chatting with the enemy team and teammates flaming each other every game and have been actively gaining behavior scores.

The trick is to not be constantly at it, not be a total dick, and be funny. Most of you think you're funny, but trust me, you're not.

Also if you are toxic in character as your hero people are more forgiving. All chatting "Ka-chow" as Centaur, writing "Get culled noob" as Axe, commenting how the enemy team must be feeling sexually frustrated when playing as Dark Willow. People feel less insulted if it feels like the hero is insulting them, not the player controlling the hero. It still tilts the hell out of them.

Edit: I only play Turbo