Am I the only one who thinks Sakurako probably bought the publishing company, fired/beat the editor dude, and that's why she left?
Also, I think sh*tty behavior isn't just reserved for men in this manga. There was that one bully who wanted to throw juice at Tadokoro that was deflected by Sakurako - and yes it was just typical bullying but who knows how physical things could have gotten if Kirigaya didn't intervene.
Kirigaya herself wasn't afraid to get physical before she reformed. She shoved Tadokoro to the floor. It might not seem like a big deal compared to what these guys are doing but Kirigaya probably used to hurt Tadokoro when they were in middle school. That one guy went to middle school with them, knows Kirigaya's reputation when it comes to Tadokoro, and probably witnessed how Tadokoro just took it so that's why he thinks he can get away with doing these things. Kirigaya's actions probably would have escalated too if she were still a bully.