Lol. You can't win with those netizens and hardcore K-pop stans.
If idols are open about their friendships and social interactions with other idols of the opposite gender, those 'fans' will complain about why those idols are so blatant and shameless about it, like with this afterparty.
If idols on the other hand keep their relationships and blossoming friendships a secret, then as soon as a whiff of it gets out, 'fans' will complain about why their idols were so sneaky about it and how it's a betrayal.
The only way that's apparently acceptable is if idols keep celibate and away from relationships, until they're in their 30s and those 'fans' that kept complaining about their idols' social and dating life don't care anymore and have had their own relationships and a bunch of kids themselves.