I find this topic difficult to debate because media attention / misunderstanding has, in my opinion, altered the meaning of the word for those of us who have been online "from the beginning".
The confusion is when genuinely malicious, deliberately harmful comments, designed to cause real injury, are flippantly described as "trolling" (facebook / twitter "trolls" etc.) and that's the meaning the word has now taken on. What it really is, or was, is more like a gentle ribbing / employment of satire that
can actually have a point if used sparingly and with awareness.
So basically... it depends which variety you're talking about
.