I myself gotten bad comments pretty often, especially when I was posting in webtoon Indonesia in the first half of 2016.
They range from short idiotic comments to longer idiotic comments and many of them were baseless opinions/critics
Most people who hated my comic didn't like that I wasn't drawing at all and used this instead https://store.steampowered.com/app/262490/Manga_Maker_Comipo/
(which isn't against the rules)
At first I've had a troll who spammed all my chapters with rude comments, in most of them he called my comic "trash", in others he said the application I was using was "trashy" and he often got replies from my fans and was told that if he should stop commenting and if he doesn't like my series he shouldn't read it then he replied them back calling them stupid for liking my comic.
Every time I updated my series he came back at me to hate and I couldn't do anything to stop him from commenting, there were no "delete" or "block" buttons.
As time went by I got other haters too, who didn't comment that much as him. They were also hating on the application,
they were like If you really want to make a comic, draw by yourself, don't use that software
Any comic that's not handrawn is trash, Admit it!
This is not allowed on webtoon, webtoon is for drawings
Why are you using comipo??
This is Webtoon not Comipotoon!
If you want to tell a story, better go to wattpad
that's lazy!
Webtoon is for comic creators not for comic editors moron!
this is trash!
This comic is a crap that should go down the toilet.
Why hate comipo? I'll tell you why, I'm an author I draw by myself, I do the story by myself, comipo is just lazy and it's for those who are lazy and don't want to draw and has graphics like video games have, so guys stop reading comipo comics and read only those that are handrawn. (this one was from a possible liar, I couldn't find their comic)
"Can't draw? write a book"
I do more appreciate a terrible drawn done by the author himself than something looking nice that isn't the author's work
I'll report this
This is disrespectful to the authors who draw by themselves
The fanarts look better than the comic because they are drawn. (yeah I got fanarts.)
art like this isn't allowed on webtoon!
People often complained about the application/software I was using and even assumed I was breaking the rules of webtoon and the copyrights when that was not true at all, although the 3d characters weren't mine neither the backgrounds, I had the right to use them also webtoon never said "don't post comics that aren't drawn" or "our place is for handrawn comics only".