Seriously, of course it's not your fault, Turbine is all alone on this, but don't expect to get much love for what you did. Heal champs are as disgusting to me (and a lot of other players, freeps and creeps alike.) as heal wardens and on pure principle gets called out. I don't even care if I can eat you on my own or not.
If I were them, would I bother to log a freep and give you a immature trashtalking? Of course not. If I were you, would I bother come to the forums after with this petty incident. Absolutely not.
Ignore them, walk on. Have a nice day.