Your text is an indication that your account has been punished recently. What kinda ban is it?
If you were punishable it is because of a specific action that didn't facilitate a civil environment in that game and that is what possibly made the report against you justified, progressing you another tier of discipline.
It does suck. We are expected to be civil at all times, so the best course of action is to avoid talking to flames beyond "Let's stay focused" and not responding to anything other than immediately helpful info about the game. (For instance, instead of typing "gi" I opt for either "XYZ is coming" or "all clear, go to 'objective'". At no point do I talk about anything else. This is my 2nd main account and some grunt scrub is not worth losing any more legacy content).
Bottom line, a flamer is no reason to lose it. If they say "KYS", reply with "Keep your socks" mute them, game on, then report. I stay focused.