Sorry but no matter where you go you're expected to act like a mature person. Online is no exception. As for why you got banned, hate speech is not acceptable anywhere period (never has been and never will be either) and will almost always result in either a 2-week ban or a permaban right on the spot. If you want to mess around with your friends then that's fine, but do it in an environment where it's just the lot of you and that's it. If you take that kind of behavior to random strangers then expect to be held accountable for your behavior.
If you're not willing to interact with others in a neutral or positive manner then multiplayer online games are not for you. From Understanding the Tribunal:
1) What's the point of having a language filter if I can get banned for 'adult' language?
a) We aren't out to punish players who use adult language; in fact, very few players are ever banned for saying stuff like "f***, I missed that skill shot" or "damn, fing close game!" However, the language filter is not an excuse to verbally abuse someone in the game. When you verbally abuse or harass someone by calling them "fing *****" or "ngger noob", that's when you've crossed the line and will be punished by the Tribunal. I've said this before and I'll say it again, we aren't trying to clean online games of adult language; we're trying to reform or get rid of jerks who like to verbally abuse and harass other players.
From Ulanopo's Knowledge Base:
People who report are simply being oversensitive. The mute button exists for a reason.
Lets start with the Riot quote on this (link (http://forums.na.leagueoflegends.com/board/showthread.php?p=30696571#post30696571)):
Why is verbal abuse punishable if there is a mute button/language filter?
Players shouldnt need to rely on features like the mute button or language filter to engage with other players in positive ways. When a player verbally abuses another player and forces him to use the mute button, they have already created a negative experience for that player.
Simply put, Riot says no. You can scream and cry all you want, but it is their house and their rules.
With that out of the way, I think the topic deserves some further discussion. The theory is that, if people resolved to care less, then they would be happier. I often refer to this as Argument from Stoicism and I think it is a fairly weak philosophy because it places the burden on the person being expected to endure the behavior rather than the person exhibiting the behavior. You should be able to handle it is just a flimsy excuse for being a bully or a jerk. I have to be the bigger man so that you can do whatever you want? That hardly seems fair.
There is also the issue of how I spend my limited free time. Like most people, I am constantly required to make value judgments between the different forms of entertainment that are available to me and, let's be honest, we live in an age of nearly limitless entertainment options. If I'm having a bad day in League, I can just fire up Steam and play a whole bunch of games that don't require me to put up with someone's BS.
This is not an issue of weakness or thin-skin; it's a question of choosing activities that don't leave me feeling frustrated and angry. Too many of those experiences and I'll just find something else to do. Riot knows this.
EDITED 18 JULY 2014