mate there are some epic ranters on here so i wouldnt worry about that, and half of them are whiney scottish t**ts
its generally understood that people rant at themselves and the game and everyone pretty much accepts that, i know i rant at myself when i old man's Johnson up
as you say people you know you can abuse as well, you should hear me and goldenbeard when we play each other, but obviously you have to know someone to do that
muting the mic is fine as well, as some people prefer not to talk during games, the reason we have them on is so you can discuss anything you need to in game, if going for it, if you have to pause to answer door etc, just makes communication easier and you get to know people on site and in your leagues etc