Why are people normalizing skeletal bodies in idols?

The "After Like" era of "IVE" was one of the most talked about of said group, because Woungyeon looked extremely thin, which worried many fans, she had always been thin, but in those previews she looked very fragile, other so-called kpop "fans" proposed it indirectly as a beauty standard that should be met with extreme regularity, leading other kpop "fans" to call other idols with healthy bodies and weight "fat" or for having suddenly gained weight, an example of this in the case of Jeongyeon, who after having suddenly gained weight due to the intake of anti-depressants and medication, received massive hate from Korean Internet users.