The reason they invented ignoring / muting is so you don't have to put up with somebody over the internet. Though, there's multiple reasons why somebody doesn't get around to doing so on CSS. They never had to use it. They don't know where it is. Laziness. Abusing the microphone icon that displays over your head every time you key your mic.

Though - as much as I want to say it, we SHOULDN'T have the need to mute people through the player list. Feel free to say whatever you want, but if somebody doesn't like it, they are gonna say something about it. And if they have the power you don't, expect to be muted if they don't like it either. That's my view on it.