Unfortunately, this happens more than people realize in the Entire KPOP industry.
Any little thing they do or are, the fake fans want to make their lives miserable as hell to the point where some members spiral down so much emotionally, recover slowly after deciding to leave the industry or worse - as in taking their own lives.
Using aespa as another example, this was the whole point of their song, Life's Too Short.
I think since their debut, Korean netizens have dug up dirt on them and trashed them for any little bad thing the netizens considered disgraceful or immoral.
So with aespa's song, they're saying people who trash them need spend their time doing better things and leave the group alone.
It is so disgusting to read about things like this, and many other instances, because it'll always be a problem that, I think, will never go away.