Free speech only goes so far. There's a better way to let off your frustration than to start dogging the other players. And in the games where I have people are doing this, they're making mistakes too, if not 99% of them.

free speech doesn't entitle anyone to insult someone else. In a game where reading what gets typed is needed in a lot of cases, saying you aren't obligated to read text is sort of ignorant. If the OP got banned it's because they either abused their team verbally, or ignored their team and either feed or just didn't do anything to help, proving them to be a bad player warranting a ban. As already stated this would have to have been over multiple games, making said person even worse of a player.

Most likely, you deserved what came to you. Plain and simple.