To add on to this, as I'm someone who has been exposed to the more modern version (yes kpop ok, I'm sorry). A lot of people don't realize that the younger girls will become obsessed with these groups of artificially attractive men, and then start to insist that the guys have to be fucking each other. Not even as a fantasy, they're absolutely certain that gay shenanigans are going on. There seems to be direct pipeline between "I fantasize publicly about pretty, young men fucking each other" and "wait, maybe I am the pretty, young man!"
SOAP BOX
As a side note, I've no real idea why this happens. I suppose it's some combination of the girls thinking "well I want to fuck them so clearly they must want to fuck each other" and deciding that it's the one thing that isn't a threat to their ultimate fantasy of meeting these idols and having them fall in love with the fan. I have suggested, quite a few times, that it's kinda gross to speculate on the sexuality of literal living people, that you can't decide that someone's gay and then speculate on all the degenerate acts they're getting up to, just because it makes you wet. Just like it's gross for so many of the fans to demand that the idols can't date women, because it ruins the second fantasy. I don't really have any kpop friends anymore, I can't imagine why.