Tilda Swinton is speaking out against boarding schools, criticizing the “Harry Potter” films for presenting a romantic notion of a “cruel” system.

The 56-year-old actress, who attended an exclusive all-girls’ boarding school in Kent in the southeast of England as a girl, says she did not “benefit” from her boarding school experience and education, according to Mail Online.

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In an interview with The Scots Magazine, the “Doctor Strange” star says separating children from their parents and sending them away to school is harmful at such a young age.

“I think they are a very cruel setting in which to grow up and I don’t feel children benefit from that type of education,” the actress says. “Children need their parents. That’s why I dislike films like ‘Harry Potter’, which tend to romanticize such places.”

“I grew up under privileged circumstances and was expected to marry a duke,” she adds. “I spent a lot of time and energy making certain that I would not find myself living a life that had been preordained for me.”

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Swinton’s experience at boarding school – where she was a classmate of Princess Diana – led the actress to establish her own liberal independent school near her home in Scotland. Opened in 2013, Drumduan Upper School has no tests or exams and instead instructs students to spend their time building boats and planting trees rather than be confined to a classroom setting.

Swinton’s two children, Xavier and Honor, now both 19, were educated at the school whose principles are founded on “art-based practical learning” inspired by the ideas of Austrian philosopher Rudolf Steiner.