There are two very simple rules to never getting banned for being toxic: Be cool, and don't be a dick.
Follow those, and you're set for life. Just ask yourself, "is what I'm about to type into chat something I want someone to say to me?" If you can't answer yes with no doubts, it's not the thing to say. If you're reacting to what someone is saying, odds are you're not thinking about it. We all get angry at people in our games, all of us do. Even the most calm and chill person under normal circumstances can get frustrated.
-I- get fed up with players sometimes. But I just shout and rant and rave to the air where no one in the game will actually hear me. Yes, I'm frustrated, but I wouldn't want someone blowing up on me like that in game, therefor, I wouldn't do it to them.
Sure, sometimes even the best of people slip up and respond in the heat of the moment, but on average, they're never going to get banned because they follow two simple rules, almost all of the time.
- Be cool
- Don't be a dick.
I mean, it is really that easy. As Thumper taught me as a kid, "If you can't say something nice, don't say anything at all."