3 easy steps for when you are getting flamed
1: Take a deep breath and review the complaint objectively. ![]()
This allows for you to grow as a player. They might not be telling you in the most constructive way, but that doesn't mean that you can't learn from player feedback.
2: Don't get into an argument over it.
What is done is done. Feeding the troll will almost certainly end up in the situation escalating. "Never argue with stupid people, they will drag you down to their level and beat you with experience." -Mark Twain.
3: If the problem persists, there is a handy little mute button to press.
Just press it and all your troubles go away. 'But if I press that button it means that someone actually got to me. It is a sign of weakness! Plus I want to hear what else this rager has to say.' Welp, hope that works out for you refer to step 2 if you start to struggle. 
I hope this step by step process is insightful and helpful. Please comment below on how you personally get those nasty flamers off your back.