Well besides black pink and bts for obvious reasons.

(Reddit wise)When any positive post about them gets downvoted to 0 karma or locked, when armies and blinks start saying they feel bad for your fandom, when people/and mods start saying that posts about said group/idol/fandom need to be regulated to a few times per week because the sheer amount of hate mega threads and rant posts are made about said group is overcrowding the sub and are getting “repetitive”, when you start receiving Reddit care messages for making positive posts about the group, when even the unpopular Kpop opinion sub releases a mega thread just so people can have the unpopular opinion of saying smth nice about the group, when people start getting upvoted for saying shit like “( group/idol) deserve to get made fun of for having suicidal thoughts”. In case anyones wondering, this is the crap that went down on Reddit 2020-2021 for stray kids; this kind of drama was also brought up with the mod drama with Kpop rants (I believe one of them was an skz-anti). Of course this doesn’t just apply to skz, I just needed an example that wasn’t bts and blackpink. Personally; while I don’t think the aespa or enhypen hate has gotten to the point of “people getting upvoted for implying/saying group/idol should commit suicide” yet I’d still say they’re up there.