Prince Harry’s official royal biographer has turned on him this week as she said that he was “selfish” and “very immature” in the way he talked about how the public mourned his late mother Princess Diana after her death.

In his mental health docuseries “The Me You Can’t See,” Harry said that he’s “haunted” by the sound of horses hooves clacking down The Mall at Diana’s funeral, and that he was “outside of his body” while following his mother’s coffin down the road.

Royal expert Angela Levin, author of “Harry: Biography of a Prince,” however, was not having any of it.

“I was very shocked when he said yet again how much he resented all the people that were surrounding him and crying [at the funeral of Diana, Princess of Wales], because it was his mother, and they shouldn’t do that,” Levin said, according to Daily Mail. “It showed that he was still very immature.”

“I could understand when he was 12 feeling like that, and he said the same thing to me when I interviewed him in Kensington Palace, but I think that he is now 36 and he should be able to cope with it,” she added. “Walking behind his mother was hideous for him, but to resent the people who admired Diana and loved her and thought incredibly highly of her, I think it’s not up to him to say who should mourn her. I think he doesn’t really care what anybody else thinks – he knows that his family can’t answer.”

In his mental health docuseries, Harry said, “When my mum was taken away from me at the age of 12, just before my 13th birthday, I didn’t want the [royal] life. Sharing the grief of my mother’s death with the world.”

“For me, the thing I remember the most was the sound of the horses’ hooves going along the pavement,” he added. “Along The Mall, the Red Brick Road. By this point I was, both of us were in shock. It was like I was outside of my body and just walking along doing what was expected of me. Showing one tenth of the emotion that everybody else was showing. I thought, ‘This is my mum. You never even met her.'”