no matter how much i dislike jk the amount of hate he gets even more than the actual shita...

I said this in another comment too. It's true that there are "worse" characters, but you have to consider the whole context... Maybe other characters considered toxic are still interesting somehow, or they have some good sides, or maybe the story itself overshadows them, etc. Jaekyung is a character that simply doesn't make sense in my opinion, he has no personality, no facets... The story is just him being an as*hole the whole time, constantly attacking and insulting Dan for literally no reason, of course he just gets hate... I mean, can you even imagine a nice/positive comment? I think the comment section would just be empty...