Olympian and reality star Caitlyn Jenner has called Piers Morgan's line of questioning about her transition “disrespectful.”

Jenner, formerly Bruce Jenner, came out transgender in 2015. She went on to star in two seasons of her own reality show. Earlier this year, Jenner revealed that she's had gender reassignment surgery.

Morgan interviewed Jenner for an episode of Life Stories, The Sun reported.

Holding a male doll, Morgan asked: “You were an all-American, 6ft 2in muscle-bound guy. When you look at that guy what you think?”

“Good for him,” Jenner responded. “There is a lot more to this story than just that.”

Morgan pressed on, asking Jenner for details about her transition.

“How does your physique compare now to what it did then? Obviously, certain areas we know about,” Morgan said.

Jenner refused to answer the question.  Instead she criticized Morgan's line of questioning.

“You made a comment there and that's why you would get in trouble, Okay? You said, 'certain areas' – that, to a trans person is disrespectful. It's not funny. It's life. It's a very serious part of my life. I take that very seriously and so out of respect to myself and the community, it's not something that you joke about.”

“This is serious stuff. People die over these issues. It's not a joke,” Jenner added.

“Point taken,” Morgan replied.

In 2014, transgender activist Janet Mock claimed that Morgan had “sensationalized” her story.

(Related: Janet Mock returns to Piers Morgan Live: I was born a baby, not a boy.)