This comment on reddit has blown my mind a little bit, seriously.
Feyre, Elain, Nesta (golden child/scapegoat) : r/acotar
Basically, it points out that when Nesta was dealing with her trauma, everyone's solution was basically to do to her what was done to them.
Morrigan said to throw her out and leave her vulnerable to attack and abuse, just like Morrigan was.
Amren suggested locking Nesta in a dungeon, just as Amren was.
Cassian belittled her and made her feel small, just like Cassian was for being a bastard.
Rhys dangled her as a bait and pimped her out to Eris, just he like had to do to himself UTM with Amarantha.
Elain supported locking Nesta up in the House of Wind, just as Elain was after being Made.
Feyre was also locked up by Tamlin and did the same thing to Nesta.
It's like they've identified a "problem" in their little court, one in need of a "solution", and took advantage of that to get pay back for what they went through by doing it all to Nesta, who ugly and visible in her trauma, and is refusing to play happy families with the rest of them.
(I could theorise why Azriel isn't actively involved in doing this to Nesta, more passively allowing it, seeing as he went through extreme physical abuse from his family, and while I would like to assign benign motives, the fact is that as the court of torturer, if he wanted to take his trauma out on others, then he has plenty of opportunities to do so.)