Well, what happen to Blackswan recently, April, IoI, T-ara and probably many more make me realized, that boy groups having more possiblity to be real close with each other than girl groups.
Even around me at university and school, boys are easier to close to each other even just after a day they meet while girls mostly will hang out with only certain people and most likely will form small groups even in the same class.
And some girls also can get emotional and jealous easily more than man over small things (I'm a girl and I admitting this fact). So with all this solo popularity among members, I think it just make thing harder to pretend liking each other anymore. I just hope at this point the groups I like genuinely close or at least tolerate one and another. I cannot take any of this anymore 😭