The answer seems to be "toxic masculinity". (Since I had to clarify this last time: the term refers to expressions or expectations of masculinity and masculine behaviour that are toxic, not a claim that masculinity is toxic in and of itself.) > For one thing, boys’ schools are more violent places, concluded the study > Boys also reported worse relationships with their male teachers > male teachers were three times as…
> For one thing, boys’ schools are more violent places, concluded the study
Many cultures have a norm that violence against men and boys is more acceptable than violence against women and girls; I think this difference in the schools is an instance of that norm. If the norm were reversed, the feminist movement would definitely call it "sexism", not "toxic femininity".
> The separation of students, teachers, and administrators into single-sex public schools may serve cultural and religious purposes, but it seems to create an unintentional ghetto for boys
Historically, many universities in the United States were segregated by gender, leading to worse outcomes for female students. The feminist movement called this "sexism", not "toxic femininity".
> “Boys don’t feel that school can necessarily help them reach manhood.”
In the United States, STEM is traditionally seen as a masculine field, which is part of the reason why fewer women choose STEM subjects. This could be phrased as "Girls don't feel that STEM subjects can help them reach womanhood." The feminist movement calls this "sexism", not "toxic femininity".