It was a LOT of comments on two separate occasions by two different people, one of them was on dA, another was on a site my comic was uploaded to without my permission (A reader informed me that they had first encountered/read my comic on a porn site)
Raven Wolf was the comic that was re-upload, and there was a reader that would basically leave horrible insulting comments about both me and the comic while constantly starting fights with people that liked the comic. At one point someone asked them why they are reading the comic when they clearly hate it so much, and to go do something else that they might enjoy more, and their response was "I want to watch the artist inevitably crash and burn."
The comic that I got harassed for on dA was No Future and this dude would leave... really really really long paragraph filled hate messages on random pages that I posted, he would also fight other people leaving comments. He was basically pissed I was updating this comic more often than I was updating Raven Wolf. Additionally, every time someone gave him a bad review on one of his dA uploads he blamed it on me for 'sending the trolls after him' he also started demanding that I write a public apology to him for 'convincing my readers to attack him' which I never did. (even when I looked at the comments in question they were all left by people that I had never heard of that do not follow me)
Anyway, the comment that bugged me the most out of the many many many many hate filled rants this guy left on my pages was basically the comment he left when he found out I was sick and thus, why I was working on a comic about a character facing his death. This dude got livid, and basically left a long ass hate filled message directed at me that contained the comment "So you're basically going to die, wow, thanks for wasting my time. How dare you get me invested in a comic that might never be finished because you might die." Which of course was followed up by a long argument on how I should have never started a comic if I knew I was sick because doing so means I don't care about my readers.