March 6, 2015 6:58 AM EST

Eleven-year-old Liam Scholes faced punishment at his British high school when he showed up for class dressed as the title character from Fifty Shades of Grey.

Sale High School, in northern England, was celebrating World Book Day on Wednesday and students were encouraged to dress up as characters from books. Taking his cue from the worldwide best-seller by EL James, which famously features a lot of explicit sex and bondage, Scholes dressed up as Christian Grey, wearing a gray suit and carrying cable ties and an eye mask. The school reportedly deemed the get-up “inappropriate” and kept the boy out of the class photo.

Yet the boy’s mother, Nicola Scholes, feels the school’s stance is hypocritical, as she explained to the BBC that the school felt it was “appropriate for a teacher to dress up as a serial killer” and “acceptable for kids to dress up as people that kill others” and “come in with [toy] guns.”

“Liam was advised to dress as James Bond, but he was promiscuous and a murderer,” she said. “Personally, I’m more offended by a murderer.”

She also said that her son’s friends “all talk about sex” and the costume “has been massively blown out of proportion. It was meant as a laugh and tongue in cheek.”

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