People love to talk about this group v group, this artist v that artist and so forth
I'm a fan of Basketball and the endless debates over who's the GOAT who has better stats etc etc is exactly the same as kpop fans arguing over daesungs, PAKs, stats, achievements, endorsements you name it there'll be a comparison.
Because at the end of the day in some aspects Kpop is like a sport - it is COMPETITIVE
Each group has its fans and they are competing for views, sales, endorsements etc.
Each group's fans will obviously support their own "team" and cuss out other teams because having supported one's team you're obviously not going to support the "enemy" team (where are my multis at? holla!!!!).
There are also direct face-offs such as award season and music shows - one compete against each other for daesungs, bonsangs etc.
I just thought I'd share my thoughts