aww can I just say thanks for trying to be polite about it
It's a huge fandom and all these have their own brand of crazy, I had to deal with some delusional fangirls myself
Some Cassies and ELFs can be exceptionally scary.
But what can we do, it really just depends on where you hang out online .. If you want to avoid them just stay away from Allkpop (or pretend the comments section doesn't exist, that's what I do), Koreaboo, and 50% of the tumblr kpop population.
Some of the batshit-crazy-but-harmless ones are even funnier than trolls though
.. The stuff on Kpop Secrets are so hilarious
.. "OMG YOUR OPPA STOLE MY OPPA'S BALLOON COLOR" .. "GUYZ YOONA IS MY BFF AND SHE READS KPOPSECRETS AND YOUR BASHING MAKES HER CRY STOP PLZZZ" .. "THINKING OF DOOJOON HELPS ME POOP !"
( I wish I was making these up but I'm not that creative)