Mistreatment is abuse, verbal or physical, not supplying your artists dorm with its needs, making fun of your artists, not paying them or hurting them in any way.
People say CLC deserves better and that there mistreated but they are not, they are only mismanaged. Theres no mistreatment, it's just that Cube does not really care about promoting them because there not making them enough money.
Same goes with blackpink, they aren't mistreated they are actually doing pretty good, I do agree that YG has done a lot of questionable things before but it is not near abuse or anything like that. In the hiatus period I think a lot of fans threw around mistreatment like it was a play word, a lot of fans do not know the meaning behind words like this, they were mismanaged but not mistreated.
Same goes with words like under rated or over rated, And with the word sexualizing, people say a lot of idols are uncomfortable but how do we know how they feel? What if they like to wear outfits that make them feel sexy or whatsoever? This doesn't apply to minors obviously but stop throwing words around that you dont understand, it makes those words have a lesser meaning and people dont take them seriously anymore.