My personal outlook at it is that I'm fine with getting mad when teammates aren't up to snuff
But unless [i]they[/i] start talking crap, nobody else should.
We have comms to try and help our teammates win, not to aggravate them. If you're only gonna use it to talk down to somebody without ever trying to help, then don't use it at all.
I'll complain as much as I want about my teammates to my friends, but never to those teammates unless they provoke it by saying something aggravating first.
All it does to go in chat and talk down to people is get them tilted. Makes your chances of winning worse.
The same applies to the people who think "stop dying idiots" is good advice. It's not.