Absolutely, 'flaming' is a recent, made-up word. Every word in the language was at one time made up. New words are constantly being added to dictionaries. "Flaming" is in the latest edition of Websters (I have a strange hobby of reading the dictionary for enjoyment
). My personal favorite recent made-up word (phrase) that is now in Websters is "dumpster fire"
.
I agree that most if not all of the responses that Mike quotes were probably not intended as flaming. I also agree it can be hard to tell at times and intent is often misunderstood by the party who feels scorched.