(Shared Throw away account)

I have a friend who is into humiliation play.(side note: She is an extreme brat and often gets punishment) She recently got a new dom who has multiple subs and during a group play session, he made her beg while he engaged in Intercourse with another sub. She expressed to me that he then begain laughing at her in a way that made her feel uncomfortable.He belittled her among saying some other things. She said she started crying and felt really ashamed but not sexually like she thought she would, soon after all the other subs in the session begain laughing at her too but he didn't say anything to them. She used her safeword and went home after because she felt embarrassed and humiliated in a way that didn't side with her kink. She ended up getting a call from her dom and told her it was unprofessional of her to leave in the middle of a session because she didn't like what was happening. She said that she told him she gave consent for him to sexually humiliate her not laugh at her or allow his other subs to laugh at her. He told she was being dramatic and she would no longer allowed to be involved with group play sessions if she continued to be dramatic. She now thinks she was the one out of line and that she doesn't actually understand what a humiliation kink is. She's now going through a sub drop because she didn't receive after care and he belittled her. (Ps added: She did talk to this guy before hand what her limits where and ignored them in more ways then one. He didn't offer after care and didn't offer to sit down and talk things out to set better boundaries for the both of them.) Any advice on what she should do?