This literally just happened to me. I'm not sure if I can post names and guild names publically so I won't even though this guy deserves to be shamed.
I stumbled upon a priest in HoR who was blaming me as a 4,5k resto druid of not knowing how to heal when I was literally blanketing the whole group and dispeling curses/poisons whilst he couldn't even cast a single dispel on the group, doing 4k dps as a 5,9k shadow priest with horrible gemming, leave the fact that the other 2 dpsers were standing all the time on flamestrike of course (and cherry on the top, all of them had aggro of one mob 24/7).
In spite of this toon's healing limitations I know I'm good anyway and it still makes me salty that there are people like this who will just dump all this bull**** on new people trying healing for the first time, without having the minimum consideration of thinking for 10 seconds why the group actually wiped. People just want to get their butts carried or perhaps they don't even have an idea which still doesn't make it okay.
I found out later on after inspecting this priest that he is the GM of a guild with 0 achievements and I feel sorry for anyone in his guild, probably when they wipe in ICC they blame healers too lul.