On the topic of healer specific woes; I have advice:
You start with 100 medals. Try to win with at least that many. Preserve your life, don't compromise yourself for an overzealous team member.
Mark yourself and remind players to stay close to you. Do your best to follow them without surrounding yourself with attackers.
When insults are thrown, either ignore, or engage the other player passively.
DPS: "What the hell are you doing? Why aren't you healing? You suck."
Healer: "Not my problem."
"I was being disrupted."
"I need you to stay closer to me."
"Sorry you feel that way."

Whatever. I just use: "Not my problem."

If you or I am really the worst healer ever, I feel as if the other players should be prepared to play differently with that consideration.
If not, then they should have que'd as healer and became part of the solution. ( ' w ')b