Hear me out.
If you are a kpop fan and your favorite group is doing well in Asia then suddenly becomes popular in the West and then shifts its focus to the West that is them saying "We aren't making music for you anymore.
They are going to change their sound to fit with Western standards to appeal to non kpop fans. Which means they aren't making the music anymore that attracted you to them. The classic "If I wanted western music I'd listen to Western music" argument.
Believe it or not but there were actually BTS fans that dropped them when they blew up in the West.
This video is comedy but its actually very true.
If f(x) blew up and then changed to doing Destinys Child music I would have slapped them like Will Smith and yelled at them KEEP DESTINYS CHILD OUT YO FUCKING MUSIC!!!! Cause that ain't why I stanned you.